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 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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