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1. Why was Kohoutek referred to as“the comet of the century”?
[ A ] It was thought to be extremely old.
[ B ] It passes the Earth once a century.
[ C ] Scientists predicted it would be very bright.
[ D ] Scientists have been tracking it for a century,
2. In what respect was Kohoutek a disappointment?
[ A ] It could be seen only through special equipment.
[ B ] It did not approach, the Earth.
[ C ] It did not provide valuable scientific information.
[ D ] It was moving too rapidly for scientists to photograph.
3. According to the passage, what is one major component of Jupiter?
[ A ] Hydrogen cyanide.
[ B ] Methyl cyanide.
[ C ] Hydrogen.
[ D ] Ammonia.
4. Which of the following questions is best answered by information gained from Kohoutek?
[ A ] Where were comets formed?
[ B ] When were comets formed?
[ C ] Where was the solar system formed?
[D] How was the solar system formed?
5. What is the main topic of the passage?
[ A ] What was learned from Kohoutek
[ B ] What was disappointing about Kohoutek
[ C ] Where Kohoutek was spotted
[ D ] How Kohoutek was tracked
参考译文
它并非专家们预言的“世纪之星”。但考胡泰克提供了大量新的科学信息。一位在天空上搜寻小行星的天文学家在距离地球3亿7000万英里处首次发现了这颗彗星，它就以发现者的名字命名。在它经过地球前的l0个月里，追踪观察它的科学家们预测这颗彗星将形成一个壮观的景象。但考胡泰克并没有预言的那么壮观，苍白得用肉眼无法看见，使得几百万业余天象观测者大失所望。不过研究人员非常高兴，因为他们从对彗星的研究中收集到了新的信息。最有意义的发现可能要数鉴别到两种重要的化合物——甲氰化物和氢氰化物——这两种化合物以前从未在彗星中发现过，但曾在遥远的星际空间发现过。这项发现为彗星的起源提供了新的线索。大多数天文学家都同意彗星是太阳系产生过程中的原生残余物。但它们是产生于木星和海王星之间还是更远的星际空间，却是一个很有争议的问题。如果在彗星里找到的化合物不比木星的主要成分氨和甲烷更复杂，那就说明彗星是在行星轨道内形成的。但是更复杂的化合物，例如在考胡泰克上发现的甲氰化物，说明彗星形成于行星以外的空间;那里空间中的严寒保持了它们的原状。