【www.guakaob.com--高三】
凉山州2016届高中毕业班第二次诊断性检测
英语
本试卷分选择题和非选择题两部分。第I卷(选择题)第1至6页，第且卷(非选择题)第7至8页，答题卷2页，共计10页，满分15。分，考试时间120分钟。
注意事项:
1.答题前，考生务必将自己的姓名、座位号、准考证号用0.5毫米的黑色签字笔填写在答题卡上，并检查条形码粘贴是否正确。
2.选择题使用2B铅笔涂在答题卡对应题目标号的位置上;非选择题用0.5毫米黑色签字笔书写在答题卡的对应框内，超出答题区域书写的答案无效;在草稿纸、试卷上答题无效。
3.考试结束后，将答题卡收回。
第I卷
第一部分听力(共两节，满分30分)
做题时，先将答案标在试卷上。录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。
第一节(共5小题;每小题，.5分，满分7.5分)
听下面5段对话。每段对话后有一个小题，从题中所给的A, B, C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
例:How much is the shirt?
A. #19.15. B. #9.18. C. #9.15.
答案是C
1. Where is the woman’s new house?
A. At a bus stop. B. Near the train station. C. Near an airport.
2. What do you learn from theconversation?
A. The woman preferred taking a taxi to taking a bus.
B. The last bus left 5 minutes ago.
C. They had to walk home.
3. Why is the man angry? Because
A. the telephone rings too much B. he loses his job C. he has too many visitors
4. What does the man mean?
A. The doctor will be with the man soon. B. He doesn't know why she came here.
C. He is Dr. Johnson.
5. What’s the most probable relationship between the speakers?
A. Doctor and wife. B. Husband and wife. C. Teacher and student.
第二节(共15小题；每小题，1.5分，满分22.5分)
听下面5段对话或独自，每段对话或独自后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置，听每段对话或独自前，你将有时间阅读各个小题。每小题5秒钟;听完后，各小题将给出5秒钟的作答时间。每段对话或独自读两遍。 听第6段材料，回答第6至7题。
6. How much is the woman’s package?
A. 4 kilos. B. 5 kilos. C. 6 kilos.
7. How much does the woman have to pay?
A. 11 pounds. B. 6 pounds. C. 5 pounds.
听第7段材料，回答第8至9题。
8. What is the woman' s brother?
A. A postman. B. A poet. C. A writer.
9. What does the man plan to do?
A. Visit the woman’s brother later. B. Prepare a gift. C. Meet the woman at once. 听第8段材料，回答第10至12题。
10. Where is the woman working?
A. In a ticket office. B. In a government office. C. In a lost&found office.
11. When did the man lose his coat?
A. This morning. B. Yesterday morning. C. This afternoon.
12. What will happen later?
A. The man’s Wlfe Wlllcome to help him.
B. The man will give acall to his wife.
C. The man will get back what he’s lost.
听第9段材料，回答第13至16题。
13. Whatcan the man see in sight?
A. A hotel. B. A restaurant. C. A bar.
14. How does the man go to the woman’s house?
A. On foot. B. By car. C. By taxi.
15. Why does the man get lost? Because
A. he is in a strangecity B. he doesn't look at the map
C. there wren’t any road signs in thecity
16. How can the man get to the woman’s house? Follow
A. Queen Street and then turn left B. James Street and then turn right
C. Queen Street for 3.5 miles
听第10段材料，回答第17至20题。
17. What is the name of the course?
A. Intercultural Commerce. B. Interaction in Communication.
C. Intercultural Communication.
18. What time does theclass meet? From
A. 3:05 p.m to 4:15 p.m B. 3:15 p.m. to 4:50 p.m C. 3:50 p.m to 4:50 p.m
19. On average, how often will theclass meet in the research lab during the last part of the course?
A. Once a month. B. Twice a month. C. Three times a month.
20. Which item was NOT mentioned as part of determining a student’s final grade in theclass?
A. Sports Participation. B. A research project. C. Presence of theclass.
第二部分阅读理解(共两节，满分40分)
第一节(共15小题;每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(}A,B,C和D)中，选出最佳选项，并在答题卡上将该项涂黑。
A
Historians usually just study great things that happened in the past time, but Drew Faust has
made history! On February 11, 2007, Faust was named president of Harvard University. She is the first woman to hold the position in the school’s 371 year history.
"I am a historian," she said. I've spent a lot of time thinking about the past, and about how it shapes the future. No university in thecountry, perhaps the world, had as remarkable a past as Harvard’s."
"And ourcommon enterprise is to make Harvard’s future even more remarkable than its past. That will mean recognizing and building on what we already do well. It will also mean recognizing what we don’ t do as well as we should, and not being satisfied until we find ways to do better."
It is her great desire for improvement and willingness to try out ideas that have given Drew success in a world controlled by men. "This is a man’s world, my girl, and the sooner you learn that, the better off you’11 be." Drew Faust recalls her mother telling her this when she was young, but she didn’t accept it.
Faust grew up in a well-off family in Virginia’s Shenandoah Valley in the 1950s. Even then She was a trailblazer(先驱).A conversation with her family's black handyman and driver inspired Her to write a letter, on school notebook paper, to President Dwight Eisenhower.
She asked whether he could help bring US citizens together in the south, a much divided
part of the country at the time.
"Drew Faust is a historian with her eyes on the future," said Susan Graham, a professor of Harvard. Many of the university’s schools said that they believe Harvard will have a brighter future under the leadership of Drew Faust.
21. Why does the writer Drew Faust has made history? Because
A. she was president Harvard University B. Harvard has a remarkable past
C. she was the first woman to be president of Harvard University D. She is a historian
A. usually study history or write about it B. are usually women
C. are usually born in well-off families D. are usually presidents of universities
23. What did her mother mean by saying "This is a man’s world, my girl..."? To A. encourage her to do men’s work B. tell her to do things as a girl should do
C. ask her to be well-off D. expect her to be a historian
24. Which of the following is true according to the passage?
A. Faust was born in the north of the US.
B. She wrote a letter to President Eisenhower when she became president of Harvard.
C. Faust’s desire for improvement and willingness to try out new ideas has given her success.
D. Historians just care about great things that happened in the past.
B
People feel differently about advertising.People who are against it often argue that it is immoral. They say ads are full of tricks. They also contain mistakes in grammar. Other people say advertisers have a right to speak freely. This is guaranteed by law. They point out that people do not have to view the ads.
Weasel words Advertisers often use special words or phrases.Thesewordsor phrases are often misleading. These words are called "weasel words". Advertisers are free to use them as long as they stick to the rules. The government decides what these rules are. Examples of weasel words are "helps", "virtual", "new and improved"，and "like".
"Helps" People often think"help"means stop.Advertisers use it so that they can say things that aren’t necessarily true. Legally, help means to aid or assist. For example, a product can "help" cure indigestion. In fact, the product down’tcure indigestion. Can you think of some ads that use“help"?
"virtually" To advisers, "virtually" means "not really" or "not in fact". If you see an ad that says this cold medicine relieves virtually all symptoms, the ad〔ould really mean it doesn't relieve any symptoms. Can you think of some ads that use "virtually"? "New and Improved" A product can only be considered new for six months. Any small change in a product will make it new. Often, this change does not make a product better. Yet, the change often makes it more expensive. New is often used with "improved". Can you think of some ads that use "new" and "improved"?
"Like" "Like" can mean "not in fact". Some products claim they work "like magic”.Like often takes the audience’s attention off the product.Think of "like magic.”If things are like magic，they are not magic.Can you think of some ads that use "like" or "like magic”?
A. so that they might mislead consumers B. so that they are able to show their wisdom
C. because the government allows them to D. because they have the freedom of speech
A. mean what they say B. show they are honest
C. tell the consumer the truth D. trick consumers into trusting their products
.
A. better B. newer C. dearer D. less expensive
C
social pressure when we are with a group of people. In one classie experiment, people were shown a vertical line and asked to find a line of identical length from a selection of three.
You might think that this is an absurdly easy task, and when people perform it by themselves they do it very well. However, psychologists have discovered that we are very easily swayed by the opinions of other people when we do this task in a group. In one study, a group of three people was set up,where two of the people were confederates(同伙)of the experimenter.When the confederates deliberately gave wrong answers,people were often swayed to give the wrong answer also. In fact, 75% of people gave at least one wrong answer, with some people conforming to peer pressure on every occasion.
But why do people conform in this way? In an easy task like this, it seems that people do not want to step out of line with the prevailing opinion of the group. On more difficult tasks, people also conform because they lose〔onfidence in their own ability to make decisions and prefer to trust the majority opinion instead.
A typical example of this kind of conformity arises when we come across people in distress. Would you help a woman who has been attacked in the street?It turns out that you are much more likely to go to her assistance if you are alone.When other people are also around,a diffusion of responsibility occurs. People are paralysed into inaction, because everyone assumes that someone else will go to the woman' s assistance. ”
A. seek independence B. disobey orders
C. seek pleasure D. follow what others do
A. explain why people would be influenced by the opinions of others
B. prove that people are easily influenced by the opinions of others
C. train the confederates of the experimenter as independent-minded
D. describe how people would be influenced by the opinions of others
30. In the last paragraph, according to the author,why wouldn’t one help.
A. thinks he has no responsibilities to give a hand B.thinks he has has nothing to do with it
C. is too shy to give his helping hand D .thinks someone else will offer assistance 3l.What method does the author mainly use to develop the text?
A. Giving examples. B. Cause-effect analysis.
C. Comparative analysis. D. Process analysis.
D
A MENTORING(导师制)program is giving life changing opportunities to Banbury youth.Young Inspirations was founded two years ago to provide mentoring sessions for students and unemployed young adults aged 11 to 21.
Alex Goldberg, the program’s founder, said:"We set up Young Inspirations because we wanted to give young people experiences which will potentially be life changing and broaden their outlook."
"We try to create work experience opportunities that will really make a difference to our youth. For example, we've secured internships(实习)with world-famous firms such as Honda. At a time of funding cutbacks where schools are finding it more and more difficult to offer this kind of mentoring,it is extremely important that these opportunities are available both to help
youth with their school work and grades and to give them opportunities which may help shape their futures."
Kieran Hepburn, 14, is one of a group of Banbury youth who has benefited from the program so far. On October the Banbury School pupil was ac companied by Young Inspirations staff to Paris where he was an observer at the United Nations Educational, Scientific and Cultural Organization’s(UNESCO) International Youth Forum(论坛).
The event was held for young people from around the world to seek their views on how the future of youth and education should look. Kieran joined several hundred observers, mostly in their 20s and was the only UK school pupil to attend the event. Kieran thinks the trip was a life changing experience. "Before we left I didn't quite know what to make of it, but when we got there we didn't stop. It was amazing." he said, "We went to three or four hours of debates each day and then did something cultural each afternoon."
The main theme of the forum was how youth can drive change in political and public life. It dealt with issues such as drug abuse, violence and unemployment.【凉山州盐源县2015至2016英语试卷八年级上】
Kieran said: "It has really helped me to improve my confidence and social skills as well as my school grades and I was voted most improved pupil at school in August." The Young Inspirations mentoring sessions take place each Friday in Banbury. For .
A. train staff for world-famous firms B. offer job opportunities to young adults
凉山州2016届高中毕业班第二次诊断性检测
英语
本试卷分选择题和非选择题两部分。第I卷(选择题)第1至6页，第且卷(非选择题)第7至8页，答题卷2页，共计10页，满分15。分，考试时间120分钟。
注意事项:
1.答题前，考生务必将自己的姓名、座位号、准考证号用0.5毫米的黑色签字笔填写在答题卡上，并检查条形码粘贴是否正确。
2.选择题使用2B铅笔涂在答题卡对应题目标号的位置上;非选择题用0.5毫米黑色签字笔书写在答题卡的对应框内，超出答题区域书写的答案无效;在草稿纸、试卷上答题无效。
3.考试结束后，将答题卡收回。
第I卷
第一部分听力(共两节，满分30分)
做题时，先将答案标在试卷上。录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。
第一节(共5小题;每小题，.5分，满分7.5分)
听下面5段对话。每段对话后有一个小题，从题中所给的A, B, C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
例:How much is the shirt?
A. #19.15. B. #9.18. C. #9.15.
答案是C
1. Where is the woman’s new house?
A. At a bus stop. B. Near the train station. C. Near an airport.
2. What do you learn from theconversation?
A. The woman preferred taking a taxi to taking a bus.
B. The last bus left 5 minutes ago.
C. They had to walk home.
3. Why is the man angry? Because
A. the telephone rings too much B. he loses his job C. he has too many visitors
4. What does the man mean?
A. The doctor will be with the man soon. B. He doesn't know why she came here.
C. He is Dr. Johnson.
5. What’s the most probable relationship between the speakers?
A. Doctor and wife. B. Husband and wife. C. Teacher and student.
第二节(共15小题；每小题，1.5分，满分22.5分)
听下面5段对话或独自，每段对话或独自后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置，听每段对话或独自前，你将有时间阅读各个小题。每小题5秒钟;听完后，各小题将给出5秒钟的作答时间。每段对话或独自读两遍。 听第6段材料，回答第6至7题。
6. How much is the woman’s package?
A. 4 kilos. B. 5 kilos. C. 6 kilos.
7. How much does the woman have to pay?
A. 11 pounds. B. 6 pounds. C. 5 pounds.
听第7段材料，回答第8至9题。
8. What is the woman' s brother?
A. A postman. B. A poet. C. A writer.
9. What does the man plan to do?
A. Visit the woman’s brother later. B. Prepare a gift. C. Meet the woman at once. 听第8段材料，回答第10至12题。
10. Where is the woman working?
A. In a ticket office. B. In a government office. C. In a lost&found office.
11. When did the man lose his coat?
A. This morning. B. Yesterday morning. C. This afternoon.
12. What will happen later?
A. The man’s Wlfe Wlllcome to help him.
B. The man will give acall to his wife.
C. The man will get back what he’s lost.
听第9段材料，回答第13至16题。
13. Whatcan the man see in sight?
A. A hotel. B. A restaurant. C. A bar.
14. How does the man go to the woman’s house?
A. On foot. B. By car. C. By taxi.
15. Why does the man get lost? Because
A. he is in a strangecity B. he doesn't look at the map
C. there wren’t any road signs in thecity
16. How can the man get to the woman’s house? Follow
A. Queen Street and then turn left B. James Street and then turn right
C. Queen Street for 3.5 miles
听第10段材料，回答第17至20题。
17. What is the name of the course?
A. Intercultural Commerce. B. Interaction in Communication.
C. Intercultural Communication.
18. What time does theclass meet? From
A. 3:05 p.m to 4:15 p.m B. 3:15 p.m. to 4:50 p.m C. 3:50 p.m to 4:50 p.m
19. On average, how often will theclass meet in the research lab during the last part of the course?
A. Once a month. B. Twice a month. C. Three times a month.
20. Which item was NOT mentioned as part of determining a student’s final grade in theclass?
A. Sports Participation. B. A research project. C. Presence of theclass.
第二部分阅读理解(共两节，满分40分)
第一节(共15小题;每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(}A,B,C和D)中，选出最佳选项，并在答题卡上将该项涂黑。
A
Historians usually just study great things that happened in the past time, but Drew Faust has
2013--2014新人教版八年级数学上期末测试题
一．选择题（共12小题，满分36分，每小题3分）
2．（3分）（2011•绵阳）王师傅用4根木条钉成一个四边形木架，如图．要使这个木架不变形，他至少还要再钉上几
根木条？（ ）
8．（3分）（2012•宜昌）若分式有意义，则a的取值范围是（ ）
9．（3分）（2012•安徽）化简
的结果是（ ）
10．（3分）（2011•鸡西）下列各式：①a0
=1；②a2
•a3
=a5
；③2﹣2
=﹣；④﹣（3﹣5）+（﹣2）4
÷8×（﹣1）=0；2
2
2
需的时间少用了15分钟，现已知小林家距学校8千米，乘私家车平均速度是乘公交车平均速度的2.5倍，若设乘公选法是（ ）
13．（4分）（2012•潍坊）分解因式：x3﹣4x2
﹣12x= _________ ． 14．（4分）（2012•攀枝花）若分式方程：
有增根，则k= _________ ．
15．（4分）（2011•昭通）如图所示，已知点A、D、B、F在一条直线上，AC=EF，AD=FB，要使△ABC≌△FDE，
还需添加一个条件，这个条件可以是 _________ ．（只需填一个即可）
16．（4分）（2012•白银）如图，在△ABC中，AC=BC，△ABC的外角∠ACE=100°，则∠A= _________ 度．
17．（4分）（2012•佛山）如图，边长为m+4的正方形纸片剪出一个边长为m的正方形之后，剩余部分可剪拼成一个矩形，若拼成的矩形一边长为4，则另一边长为 _________ ．
三．解答题（共7小题，满分64分）
18．（6分）先化简，再求值：5（3a2
b﹣ab2
）﹣3（ab2
+5a2
b），其中a=，b=﹣．
19．（6分）（2009•漳州）给出三个多项式：x2
+2x﹣1，x2
+4x+1，x2
﹣2x．请选择你最喜欢的两个多项式进行加法运算，并把结果因式分解．
20．（8分）（2012•咸宁）解方程：
．
21．（10分）已知：如图，△ABC和△DBE均为等腰直角三角形． （1）求证：AD=CE；
（2）求证：AD和CE垂直．
22．（10分）（2012•武汉）如图，CE=CB，CD=CA，∠DCA=∠ECB，求证：DE=AB．
23．（12分）（2012•百色）某县为了落实中央的“强基惠民工程”，计划将某村的居民自来水管道进行改造．该工程若
由甲队单独施工恰好在规定时间内完成；若乙队单独施工，则完成工程所需天数是规定天数的1.5倍．如果由甲、乙队先合做15天，那么余下的工程由甲队单独完成还需5天． （1）这项工程的规定时间是多少天？ （2）已知甲队每天的施工费用为6500元，乙队每天的施工费用为3500元．为了缩短工期以减少对居民用水的影响，工程指挥部最终决定该工程由甲、乙队合做来完成．则该工程施工费用是多少？ 24．（12分）（2012•凉山州）在学习轴对称的时候，老师让同学们思考课本中的探究题． 如图（1），要在燃气管道l上修建一个泵站，分别向A、B两镇供气．泵站修在管道的什么地方，可使所用的输气管线最短？
你可以在l上找几个点试一试，能发现什么规律？
聪明的小华通过独立思考，很快得出了解决这个问题的正确办法．他把管道l看成一条直线（图（2）），问题就转化为，要在直线l上找一点P，使AP与BP的和最小．他的做法是这样的： ①作点B关于直线l的对称点B′．
②连接AB′交直线l于点P，则点P为所求．
请你参考小华的做法解决下列问题．如图在△ABC中，点D、E分别是AB、AC边的中点，BC=6，BC边上的高为4，请你在BC边上确定一点P，使△PDE得周长最小． （1）在图中作出点P（保留作图痕迹，不写作法）．
（2）请直接写出△PDE周长的最小值： _________ ．
2015-2016学年第一学期初二数学期末考试综合试卷（4）
命题：汤志良；试卷分值130分；知识点涵盖：苏科版八年级上册；
一、选择题：（本大题共10小题，每小题3分，共30分）
1. （2015•无锡）
函数y（ ） x的取值范围是……………………………
A．x＞4 ； B．x≥4； C．x≤4；D．x≠4；
2.下列说法正确的是……………………………………………………………………（ ）
A．4的平方根是2； B．将点（-2，-3）向右平移5个单位长度到（-2，2）；
C
D．点（-2，-3）关于x轴对称的点是（-2，3）；
3.在平面直角坐标系中，若点P a,b在第二象限，则点Q2a,1b在…… …（ ）
A．第一象限； B．第二象限； C．第三象限； D．第四象限；
4. 如果点P2,b和点Qa,3关于x轴对称，则ab的值是……………………（ ）
A．-1； B．1；C．-5； D．5；
5.（2015.淮安）如图，M、N、P、Q是数轴上的四个点，
……（ ）
A．M；B．N；C．P；D．Q；
6.某种鲸的体重约为1.3610㎏，关于这个近似数，下列说法正确的是……………（ ）
A．它精确到百位； B．它精确到0.01；C．它精确到千分位； D．它精确到千位；
7. （2015•德阳）如图，在Rt△ABC中，∠ACB=90°，CD为AB边上的高，若点A关于CD所在直线的对称点E恰好为AB的中点，则∠B的度数是…………………………………（ ）
A．60° B．45° C．30° D．75°
第5题图
第7题图
第9题图 5
8.已知一次函数ykxb,y随着x的增大而增大，且kb0,则在直角坐标系内它的大致图象是（ ）
A. B. C. D.
9.（2015•泰州）如图，△ABC中，AB=AC，D是BC的中点，AC的垂直平分线分别交AC、AD、AB于点E、O、F，则图中全等三角形的对数是………………………………………………（ ）
A．1对；B．2对； C．3对；D．4对；
1
10.如图，在平面直角坐标系中，Rt△OAB的顶点A在x轴的正半轴上．顶点B
的坐标为1，点C的坐标为,0，点P为斜边OB上的一个动点，则PA+PC的最小值为…（ ） 2A
；B
； C
D
． 二、填空题：（本大题共8小题，每小题3分，共24分）
11.（2015
．
12.若点Aa,2a1在第一、三象限的两坐标轴夹角的平分线上，则a= .
13.（2015•黔东南州）如图，在四边形ABCD中，AB∥CD，连接BD．请添加一个适当的条件 ，使△ABD≌△CDB．（只需写一个）
14. 如图，正方形ODBC中，OC=1，OA=OB，则数轴上点A表示的数是 ．
o
第10题图
第13题图
第14题图
15. （2015•甘南州）如图是一次函数的y=kx+b图象，则关于x的不等式kx+b＞0的解集为 ．
16. 如图，在△ACB中，∠ACB＝90°，AC＝BC，点C的坐标为（－2，0），若点A的坐标为（－6，3），则点B的坐标是 .
17. （2015•泰州）如图，矩形ABCD中，AB=8，BC=6，P为AD上一点，将△ABP沿BP翻折至△EBP，PE与CD相交于点O，且OE=OD，则AP的长为 ．
第15题图
第16题图
第17题图
18.（2015•南通）在20km越野赛中，甲乙两选手的行程y（单
位：km）随时间x（单位：h）变化的图象如图所示，根据图中
提供的信息，有下列说法：①两人相遇前，甲的速度小于乙的
速度；②出发后1小时，两人行程均为10km；③出发后1.5
小
2
第18题图
时，甲的行程比乙多3km；④甲比乙先到达终点．其中正确的有个数的序号是 . ．．
三、解答题：（本大题共10题，满分76分）
19.（本题满分8分）
212x1；（1）计算： ； （2）求的值： x33
320
20. （本题满分5分）【凉山州盐源县2015至2016英语试卷八年级上】
如图，a、b、c分别是数轴上A、B、C所对应的实数.试化
简
abc.
21. （本题满分5分）
已知点m,n在一次函数y2x3的图像上，且mn0，求m的取值范围.
22. （本题满分6分）
如图，已知一次函数y=kx+b的图象经过A（-2，-1），B（1，3）两点，并且交x轴于点C，交y轴于点D．
（1）求该一次函数的解析式；
（2）求△AOB的面积．
23. （本题满分6分）
（2015•凉山州）如图，在正方形ABCD中，G是BC上任意一点，连接AG，DE⊥AG于E，BF∥DE交AG于F，探究线段AF、BF、EF三者之间的数量关系，并说明理由．
3【凉山州盐源县2015至2016英语试卷八年级上】
已知一次函数y12mxm1，当m为何值时，
（1）y随x的增大而增大？
（2）图像经过第一、二、四象限？
（3）图像经过第一、三象限？
（4）图像与y轴的交点在x轴的上方？
25. （本题满分8分）
（1
xy的平方根.
（2
）已知y
26. （本题满分7分）
（2014•苏州）如图，已知函数y2
8. 1xb的图象与x轴、y轴分别交于点A、B，与函数2
y=x的图象交于点M，点M的横坐标为2，在x轴上有一点P a,0（其中a＞2），过点P作x轴的垂线，分别交函数y
（1）求点A的坐标；
（2）若OB=CD，求a的值．
4
1xb和yx的图象于点C、D． 2
如图，在Rt△ABC中，∠ACB=90°，BC=30cm，AC=40cm，点D在线段AB上从点B出发，以2cm/s的速度向终点A运动，设点D的运动时间为t0．
（1）AB= cm，AB边上的高为 cm；
（2）点D在运动过程中，当△BCD为等腰三角形时，求t的值．
28. （本题满分8分）
（2015•漳州）国庆期间，为了满足百姓的消费需求，某商店计划用170000元购进一批家电，这批家电的进价和售价如表：
若在现有资金允许的范围内，购买表中三类家电共
100台，其中彩电台数是冰箱台数的2倍，设该商
店购买冰箱x台．
（1）商店至多可以购买冰箱多少台？
（2）购买冰箱多少台时，能使商店销售完这批家电后获得的利润最大？最大利润为多少元？
5
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