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
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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
Seriously-deformed zones appear _______.
A．whenever the crusts move over mantle
B．when the plates move towards each other
C．in the narrow boundaries where two plates meet
D．to be the major topographical feature of the Earth
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