天南海北 知识家园

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　　　4.In some binary systems, astronomers have shown that there is an invisible companion star, a 'partner' to_[A] the one ___which we can see in the sky.　　　　[B] that　　[C] the ones 　　[D] those

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财富榜1750362 金血狼406264 金对攻345134 金杨柳依依256062 金关刀仔211718 金点石成金201101 金闲着没事194991 金高老汉172535 金来去自由162749 金COTTO161567 金无名

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　　6.Astronomers have evidence of a few other stars too, which might have black holes as__[D] companions__.　　[A] companies 　　[B] comparisons　　[C] compounds

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orbit轨迹

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The two spacecraft will link up (with each other) in orbit.
两艘宇宙飞船将於轨道上(互相)连接。

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人造卫星satellite

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in the Milky way在银河系中

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move in___[B] orbit轨迹_round the sun

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7.The earth is one of nine planets which move in___[B] orbit轨迹_round the sun.　　[A] track 　　　　[C] tour 　　[D] route

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　　　　　8.In August 1977, a satellite was__　[C] launched __to gather data about the black holes in the Milky way.在银河系中　　[A] posted 　　[B] delivered　　　[D] transmitted