托福听力tpo15 According to paragraph 2, scientists base their belief that a mass extinction is going on at present on which of the following? 答案解析【小站备考】

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

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

The number of species that have died out since the last extinction event is extremely large.

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

Fossil records of many marine species have disappeared.

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正确答案：A

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A 以at present做关键词定位至最后一句，但这段很短，快速扫完后两句之后就有答案，说现代生物灭绝的速度和大灭绝的时候差不多，得出大灭绝现在正在发生，所以原因是灭绝速度相似，答案A。

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托福听力official15 According to paragraph 2, scientists base their belief that a mass extinction is going on at present on which of the following? 答案解析