For over 350 years men have used telescopes to find out more about the stars and

For over 350 years men have used telescopes to find out more about the stars and planets. Our knowledge of the stars has increased very greatly since Galileo, the famous Italian scientist, made the first telescope in 1609. Men have used telescopes to study the moon's surface-- its craters（环形山）, mountains and plains. Now men have recently built bigger and more powerful telescopes. They have discovered new groups of stars. Modern telescopes have shown us that certain stars are not single at all; they are groups of millions of stars.

The largest telescope in the world has a mirror which is 200 inches wide. It is at Mount Palomar in America and it has shown us millions of new stars. The light from these stars has taken a million years to reach the earth.

(1) It is ________ years since Galileo made the first telescope.

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A．more than 380B．over 350C．about 1609D．more than 30

(2) With the help of telescopes, scientists can ________.

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A．discover more stars and planets

B．get knowledge from the sky

C．study the craters, mountains and plains on the moon's surface

D．increase more knowledge of the earth

(3) Through telescopes men have discovered that ________

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A．many more new groups of millions of stars remain unknown to us

B．stars are not in a single group

C．bigger and more powerful telescopes have been built recently

D．certain stars are not single but in millions of groups

(4) The largest telescope in the world ________.

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A．has recently been built in America

B．is 200 inches wide

C．has shown millions of new stars to us

D．is the most powerful one at Mount Palomar in the U.S.

试题答案

答案：A;C;D;C