2. There are four  (街區(qū)) in my city.

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                                     B 

       Is there intelligent (有智力的) life on other planets? For years,scientists said “no” or “we don't know”. But today this is changing. Seth Shostak and Alexandra Barnett are astronomers (天文學(xué)家) . They believe intelligent life exists (存在) somewhere in the universe. They also think we will soon contact these beings (人;生物) .

       Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life ,” say Shostak and Barnett. The second reason is size—the universe is huge. “Tools like the Hubble Telescope (哈勃望遠(yuǎn)鏡) have shown that there are at least 100 billion galaxies ,” says Shostak. “And our galaxy,the Milky Way,has at least 100 billion stars. Some planets going around these stars might be similar to Earth."

       In the past,it was hard to look for signs of intelligent life in the universe. But now,powerful telescopes (高倍望遠(yuǎn)鏡) allow scientists to discover smaller planets —the size of Mars or Earth一in other solar systems. These planets might have intelligent life.

       Have beings from space already visited Earth? “Probably not ,” says Shostak. “It's a long way away. However,intelligent beings may contact us in other way,such as radio signals (信號(hào)) .In fact,they rxlay be trying to communicate with us now,but we don't have the right tools to receive their messages. However,this is changing. By 2025,we could make contact with other life forms in our universe and we might help each other.”

() 6. Seth Shostak and Alexandra Barnett are  .

   A. astronomers   B. farmers   C. singers   D. drivers

() 7. What is the best title for Paragraph 2 ?

   A. The Age and Size of Earth

   B. Our Galaxy： The Milky Way

   C. Why Intelligent Life Might Exist

   D. Earth： The Only Planet with Intelligent Life

() 8. Why was it hard to look for signs of intelligent life in the universe in the past?

   A. There were not any smaller planets.

   B. There were not any powerful telescopes.

   C. The astronomers were not interested in them.

   D. The Milky Way didn^ exist at that time.

() 9. Why haven’t beings from space visited us yet according to Shostak?

   A. Because they’re afraid of us.

   B. Because it's a long way away.

   C. Because they don't want to see us.

   D. Because they don't know how to use radio signals.

() 10. What does the underlined phrase “l(fā)ife forms” in the last paragraph mean?

   A. messages             B. tools

   C. intelligent beings   D. radio signals

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() 5.   jeans were invented over 100 years ago,they’re still in fashion today.

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() 15. Mr. Wang has left for Guangzhou. He  a speech there in two days.

   A. gives   B. gave   C. will give   D. has given

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() 3. They’ll   Shanghai  two days.

   A. leave for;in   B. go for;in   C. leave to;for   D. go to;for

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() 10. —David saved an old man in danger yesterday.

            —  We should learn from him.

   A. What a kind boy!       B. What a lucky boy!

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1. Chairman Mao that The People's Republic of China had been founded in 1949 in Beijing.

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() 2. —Why don't you  your teacher for help? —Good idea.

   A. ask   B. to ask   C. asking   D. asks

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() 5. —WeVe waited for the two singers for two hours. Will they be able to come here?

           —I'm afraid  of them will come today.

   A. both   B. either   C. neither   D. none

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