2. 外语
  3. It was surprising that ______. It is certain that ______.

It was surprising that ______. It is certain that ______.

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问题 It was surprising that ______.
It is certain that ______.
选项 A、an object had exploded three miles above the forest
B、the explosion was not caused by a comet
C、an atomic explosion once happened above the ground
D、some form of life from other planets once visited the earth then
答案A
解析 第六行“Recent studies concluded that…”，可以直接找到答案，选A。
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