tpo-15 閱讀 mass extinction Q2 - 英檢

The fossil record shows at least five mass extinctions in which many families
of marine organisms died out. The rates of extinction happening today are as
great as the rates during these mass extinctions. Many scientists have
therefore concluded that a sixth great mass extinction is currently in
progress.

2. According to paragraph 2, scientists base their belief that a mass
extinction is going on at present on which of the following?

（A）The speed with which mass extinctions are happening today is similar to the
speed of past extinctions.

○Mass extinctions occur with regularity and it is time for another one.

答案是A，但不知為什麼C是錯？？

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