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  3. It was not“the comet of the century”experts predicted it might be Nevertheless，Kohoutek has provided a bonanza of scientific inf

It was not“the comet of the century”experts predicted it might be Nevertheless，Kohoutek has provided a bonanza of scientific inf

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问题 It was not“the comet of the century”experts predicted it might be Nevertheless，Kohoutek
has provided a bonanza of scientific information．It was first spotted 370 million miles from Earth，by an astronomer who was searching the sky for asteroids，and after whom the comet was named Scientists who tracked Kohoutek the ten months before it passed the Earth predicted the comet would be a brilliant spectacle But Kohoutek fell short of these predictions，disappointing millions of amateursky watchers，when it proved too pale to be seen with the unaided eye Researchers were delighted nonetheless with the new information they were able to glean from their investigation of the comet．Perhaps the most significant discovery was the identification of two important chemical compounds methyl cyanide and hydrogen cyanide--never before seen in comets，but found in the far reaches of interstellar space This discovery revealed new clues about the origin of comets．Most astronomers a gree that comets are primordial remnants from the formation of the solar system，but whether they were born between Jupiter and Neptune or much farther out toward interstellar space has been the subject of much debate If compounds no more complex than ammonia and methane，key components of Jupiter，were seen in comets，it would suggest that comets form within the planetary orbits． But more complex compounds，such as the methyl cyanide found in Kohoutek，point to formation far beyond the planets；there the deep freeze of space that kept them unchanged
Before  the investigation of Kohoutek．where had methyl cyanide been known to exist?
选项 A、，In comets
B、  On asteroids
C、Between Jupiter and Neptune
D、Beyond the Earth’s solar system
答案D
解析 根据文章中间“…methyl cyanide and hydrogen cyanide--never before seen in comets． but found in the far reaches of interstellar space”可以看出这句话是说methyl cyanide以前只是在星际空间发现过。
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