如图5是电热水器.洗衣机等用电器使用的三脚插座和插头.它们可以使用电器外壳接地.这样做的目的是A．延长使用寿命B．防止触电C．使其正常工作D．节约用电——青夏教育精英家教网——

如图5是电热水器、洗衣机等用电器使用的三脚插座和插头，它们可以使用电器外壳接地，这样做的目的是

A．延长使用寿命

B．防止触电

C．使其正常工作

D．节约用电

下列现象不可以用惯性来解释的是

A．开车时系好安全带

B．射出去的箭继续往前飞一段距离

C．松手后，鸡蛋就往下落

D．拍打被子，使灰尘脱离被子

如图所示的四个实验中，第一次把电和磁联系起来的是

A． B． C． D．

阅读下面短文，用括号内所给动词的适当形式填空(必要时可加情态动词或助动词）。
“Everything happens for the best," my grandmother said whenever things weren't going my way. "Don't worry, one day your luck 【小题1】_______(change). "
Grandmother was right, as I discovered after graduating from college. I had decided to be sports announcer (广播员) in a radio station, so I 【小题2】_______ ( go) to Shanghai and knocked on the door of every station. But I got refused every time.
In one station, a kind lady said my problem was short of experience. " Get some work with a small station and 【小题3】_______(work) your way up ," she said.
I couldn't get a job there, either. Then my dad told me a businessman had opened a company and needed someone 【小题4】_______ ( manage) the sports center. But again, I didn't get the job.
I felt really down. "Your luck will change," Granny reminded me. I tried another radio station in Beijing. But the owner, a nice man, told me he already had someone.
As I left his office, I asked, " How can someone be a sports announcer if he 【小题5】_______(not, get) a job in a radio station?"
I 【小题6】_______( wait) for the elevator when I heard the man call, " What was that you said about sports? Do you know anything about football?" I 【小题7】_______(put) in front of a microphone and asked to imagine I was commenting (评论) on a football game. "Now you 【小题8】_______ (watch) the football game between Lu Neng and Shen Hua. . . "
On my way home, Granny's words came back to me, " One day your luck will change, boy. And when it 【小题9】 _______( happen) , it'll feel twice as good because of all the disappointment (失望) you 【小题10】_______ ( have) . " At that moment I knew just what she meant.

美国发现号航天飞船自1984年8月服役以来共飞行39次，成功完成了历次重任。2012年4月17日，发现号开启了此生最后一次短途之旅，它从肯尼迪航天中心被运出，如图所示，由一架被改装的波音747运输机“背着”，飞往华盛顿史密森尼国家航天航空博物馆，在那里“安度晚年”。则波音747运输机“背着”发现号在空中飞行过程中描述正确的是

A．航天飞机受到重力和波音747运输机对航天飞机的支持力

B．波音747运输机受到重力和空气对机翼的升力的作用

C．航天飞机对波音747运输机的压力等于波音747运输机对航天飞机的支持力

D．航天飞机对波音747运输机的压力小于波音747运输机对航天飞机的支持力

阅读短文，根据短文内容及首字母提示，在空白处填入一个适当的单词
Coober Pedy is a small town in the Australian desert (沙漠). It's famous not only for its opals (猫眼石) , but also for a very unusual【小题1】 r________—the people live and work underground.
Why do people choose to live under the ground? To avoid (避开) the【小题2】h_______ days and cold nights-daytime temperatures can rise to 50 °C or more and on a cold night they can fall to 【小题3】z_______. The locals say that their strange lifestyle is the only answer【小题4】t________ the unpleasant climate (气候) . In the underground homes, the temperature is always a very pleasant 19°C to 24°C .But that's not the only advantage ; the people there don't need to pay builders if 【小题5】 t_______want to build a home or make any changes.
You would be very surprised to see 【小题6】 h________well people manage to live underground. They have modern kitchens and bathrooms, sometimes even spas (温泉)“People think it's impossible to live here and that we're like ancient people, 【小题7】b_______ that's not true. " says Bev Smith, who has lived in Coober Pedy for over 30 years. When my husband, Larry, and I first came here, life was very 【小题8】d _______ and many people decided to leave. But now, things have 【小题9】c________a lot and we’re very comfortable. We now have underground shops, hotels, restaurants, cafes and churches!”
Abigail and Brian Tynan 【小题10】 1_______ their large house in Melbourne(墨尔本) two years ago to have in an underground home. "My mouth fell open when I saw my wonderful underground home," remembers Brian. " I really enjoy living here. "

—I think honesty is the most important thing in doing everything.
—__________________.

C．I think so, too

D．Yes, please

—I’m leaving for Canada on a study trip next week.
—___________________.

A．Enjoy your time	B．That’s all right
C．You’re welcome	D．It’s a pleasure

Complete the sentences with the given words in their proper forms (用括号中所给单词的适当形式完成下列句子。每空格限填一词)
【小题1】Climb up to the _________ floor, and you can enjoy a better view. (eleven)
【小题2】_________, Grace made up her mind to live abroad with her daughter. (final)
【小题3】It is a very __________ book for language learners to improve writing skills. (use)
【小题4】Don’t worry about your son. He is old enough to be independent and live by _________. (he)
【小题5】The movie KungFu Panda II is sure to __________ a large number of teenagers. (attractive)
【小题6】If you don’t go on a diet, it is __________ for you to lose weight. (possible)
【小题7】The local people had to move away because of the serious _______. (pollute)
【小题8】The great _______ gave his first show in Shanghai and the tickets sold out in minutes. (art)

Rewrite the sentences as required (按要求改写句子，每空格限填一词)
【小题1】We keep in touch with each other by email. (改为否定句)
We _________ __________ in touch with each other by email.
【小题2】Our school organizes an English speech contest once a year. (对划线部分提问)
_______ _________ does your school organize an English speech contest?
【小题3】The beach is a nice place for tourists. (改为感叹句)
_______ ________ nice place the beach is for tourists!
【小题4】Are there any new markets in Asia? The sales manager wants to know. (合并为一句)
The sales manager wants to know ________ there _________ any new markets in Asia.
【小题5】The university will invite many graduates to celebrate its 100th birthday. (改为被动语态)
Many graduates will ________ ________ by the university to celebrate its 100th birthday.
【小题6】We shouldn’t talk loudly in the theatre. We shouldn’t smoke there, either. (保持句意不变)
We should __________ talk loudly _________ smoke in the theatre.

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