2. 外语
  3. According to the passage, scientists used to think that the X-rays were produced by ______. We can infer from the speech of the

According to the passage, scientists used to think that the X-rays were produced by ______. We can infer from the speech of the

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问题 According to the passage, scientists used to think that the X-rays were produced by ______.
We can infer from the speech of the study leader that ______.
选项 A、the research helps to answer really big questions about lightning
B、runaway breakdown is a mechanism that may play a role in gamma-ray flashes
C、the next research might be on "runaway breakdown"
D、the researchers have a lot to learn about how even small sparks work
答案C
解析 本题考查阅读细节。先在文章中找出"the study leader"指的是谁，再找出相应的言论。见最后一段。
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