2. 外语
  3. Scientists have suggested that once every 10 million years or so a truly colossal object from space cuts through the atmosphere

Scientists have suggested that once every 10 million years or so a truly colossal object from space cuts through the atmosphere

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问题 Scientists have suggested that once every 10 million years or so a truly colossal object from space cuts through the atmosphere and slams into Earth, sending up a global pall of dust that blots out the Sun, alters the climate, and changes the course of evolution by killing off many plant and animal species.
选项 A、sending up a global pall of dust that blots
B、thus sending up a global pall of dust to blot
C、thereby sending up a global pall of dust to blot
D、and that sends up a global pall of dust, blotting
E、which sends up a global pall of dust, blots
答案A
解析 D中and之后的that从句找不到与之平行的对象。E中which从句从语法上讲，应修饰earth，但这种修饰从逻辑关系上是讲不通的。B、C既然用现在分词表伴随结果，thus和therefore就是多余的。
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