22. 布萊克先生通常在一個(gè)大商店甩買東西，偶爾他也在小店里購(gòu)物。

Mr. Black usually buys things in big shops. __________ _________  _________ _______ ，he does

shopping in small ones.

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(2014 •天津）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. Som^ 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.

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C. singers                   D. drivers

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D.  Earth ： The Only Planet with Intelligent Life

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B.  There were not any powerful telescopes.

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D.  The Milky Way didn't exist at that time.

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A.  They're afraid of us.

B.  It's a long way away.

C.  They didn't want to see us.

D.  They don't know how to use radio signals.

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