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【单选题】
Then something happened to Cosmos. It may have sprung a small leak ; perhaps it struck a tiny asteroid (小行星) or a piece of debris. Nobody knows for sure, but for one reason or another. Cosmos drifted off course. T. S. Kelso, an aeronautics expert at ytical Graphics. which provides satellite-tracking services to NASA, noticed that the orbits of Cosmos and Iridium were bringing the two satellites closer to each other all the time. In February he issued a waming that they would pass within a kilometer of one another. He was right. On Feb. 10, Motorola lost track of Iridium’s signal. Over the next few days, Kelso and others surmised (推测) that what many had feared for years had finally come to pass: two intact (完好无损的) satellites had collided head on.
What had happened to Cosmos and Iridium in February according to Kelso
A.
They had had mechanical problems.
B.
They had struck a tiny asteroid.
C.
They has struck a piece of debris.
D.
They had collided into each other.
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Unless we spend money to spot and pr asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...
A.
It is very unlikely, but the er exists.,
B.
Such a collision might occur once every 25 years.
C.
Collisions of smaller asteroids with Earth occur more often than expected.
D.
It’s still too early to say whether such a collision might occur.
【简答题】下列小行星描述正确的是( )
A.
小行星带的质量都集中少数较大的球状小行星上
B.
小行星的直径越大,颗数越少
C.
小行星都集中在土星和木星轨道之间
D.
现代小行星的探测多采用天体照相术
【单选题】2011年7月，天文学家发现了一颗直径300米的小行星，它与地球有着相同的公转轨道，并始终在地球前方“打转”。这一发现再次印证了( ) ①自然界是物质的 ②人的意识是物质世界的产物 ③人类社会是物质的 ④世界真正的统一性在于它的物质性
A.
①②
B.
③④
C.
②③
D.
①④
【单选题】Unless we spend money to spot and pr asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...
A.
They are heavenly bodies different in composition.
B.
They are heavenly bodies similar in nature.
C.
There are more asteroids than meteoroids.
D.
Asteroids are more mysterious than meteoroids.
相关题目：
【多选题】太阳系中，体积最小的行星不是（）
A.
地球
B.
火星
C.
水星
D.
海王星
【单选题】描述了行星距离太阳远近分布规律的是啥子定律或规则?
A.
哈勃定律
B.
万有引力定律
C.
开普勒行星运动第二定律
D.
提丢斯规则
【单选题】行星：发光（ ）
A.
氢气：可燃
B.
课堂：神圣
C.
海洋：宽广
D.
陶瓷：导电
【单选题】Unless we spend money to spot and pr asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...
A.
It is very unlikely, but the er exists.,
B.
Such a collision might occur once every 25 years.
C.
Collisions of smaller asteroids with Earth occur more often than expected.
D.
It’s still too early to say whether such a collision might occur.
【简答题】下列小行星描述正确的是( )
A.
小行星带的质量都集中少数较大的球状小行星上
B.
小行星的直径越大,颗数越少
C.
小行星都集中在土星和木星轨道之间
D.
现代小行星的探测多采用天体照相术
【单选题】在下列太阳系行星中，距太阳最近的是( )．
A.
水星
B.
地球
C.
火星
D.
土星
【单选题】八大行星中，距离太阳最近的是（）。
A.
木星
B.
水星
C.
金星
【单选题】ZL50装载机的变速器有几个行星排组成
A.
1
B.
2
C.
3
D.
4
【单选题】Unless we spend money to spot and pr asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...
A.
They are heavenly bodies different in composition.
B.
They are heavenly bodies similar in nature.
C.
There are more asteroids than meteoroids.
D.
Asteroids are more mysterious than meteoroids.
【单选题】小行星可以有卫星吗?
A.
有的真的有
B.
就是子虚乌有