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[originaltext] A U.S. spacecraft is completing a five-and-a-half-month voyag
[originaltext] A U.S. spacecraft is completing a five-and-a-half-month voyag
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2025-01-01
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问题
A U.S. spacecraft is completing a five-and-a-half-month voyage to a distant comet and could create celestial fireworks when it crashes into it Monday, America’s Independence Day. Scientists want to know what a comet’s nucleus is made of and believe the best way to find out is to blast a hole in one.
The target is the comet Tempel—1,431 million kilometers away. (7) As NASA puts it, meeting its head on at such a gTeat distance is like threading a needle.
(8) NASA scientist Tom Morgan describes a comet as a big dirty snowball in space, a glowing collection of ice, rocks, dust, and gases whose interior composition is intriguing.
Knowing the makeup of a comet would provide information about the chemistry and physics of the solar system as it formed 4.5 billion years ago.
选项
A、very easy.
B、impossible.
C、possible.
D、very difficult.
答案
D
解析
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