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
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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
单项选择题
The 15 plates of the Earth are formed from _______.
A．the oceanic crusts and continental crusts
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
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