单项选择题

The 15 plates of the Earth are formed from ______.

A．the oceanic crusts and continental crests
B．the crusts and the mantle
C．the crusts and the top and solid part of the mantle
D．the continental crusts and the solid part of the mantle

<上一题目录下一题>

热门试题

单项选择题

The Earth's crust ______.

A．can be classified into two types
B．is formed along the margins of the plates
C．consists of semi-molten rocks
D．is about 70 to 100 kilometers thick

单项选择题

This passage is probably ______.

A．a newspaper advertisement
B．a chapter of a novel
C．an excerpt from a textbook
D．a scientific report of new findings