填空题

Rocks in ______ have been oversampled compared with those in the tropics.

【参考答案】

the northern hemisphere

<上一题目录下一题>

热门试题

填空题

Among the time biologists, the gradualists believe in evolution by ______.

填空题

David Jablonski and his colleagues divided the Earth’s surface into two: ______ and the extratropics .