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Light travels very fast. It moves at 300,000 kilometers a _1_ . Light _2_ us from the moon is less than a second and a half. The moon is about 382,000 kilometers _3_.
Light from the sun reaches us in 8.5 minutes. The sun is about 149,640,000 kilometers _4_ the earth.
The other stars are farther away than the sun. Light from the nearest star reaches us in about four years. When you look at a star, you do not _5_ its present condition(狀況). You see it as it is used to be. Light from some stars _6_ hundreds of years to reach us. We never see a star as it is _7_ . We see it as it was long ago: perhaps hundreds of or thousands of years ago.
Astronomers(天文學(xué)家) watch the star _8_ big telescopes. The _9_ biggest telescope is in Russia. The next biggest is in the United States. _10_ these great telescopes astronomers can see stars and other things very far away. Some of these things are not only stars. They are great groups of stars.
1.A.minute B.hour C.second D.day
2.A.reaches B.getsC.arrives D.comes
3.A.high B.far C.long D.away
4. A.near B.from C.off D.of
5.A.look at B ase C.touch D.reach
6.A.takes B.take C.spends D.spend
7.A.before B.after C.now D.future
8.A.through B.in C.into D.onto
9.A.world's B.world C.worlds D.world of
10.A.Without B.With C.Use D.Used
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