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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热门试题

单项选择题

According to the second paragraph, the formation of the Atlantic Ocean is the example of _______.

A．spreading contacts
B．the influence of volcanic eruptions
C．converging contacts
D．transform contacts

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