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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

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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

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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.

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科目: 来源: 题型:阅读理解

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.

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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

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科目: 来源: 题型:阅读理解

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. "

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—I think honesty is the most important thing in doing everything.
—__________________.
A.All rightB.Never mindC.I think so, tooD.Yes, please

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—I’m leaving for Canada on a study trip next week.
—___________________.
A.Enjoy your timeB.That’s all right
C.You’re welcomeD.It’s a pleasure

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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)

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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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