单项选择题


Earth cooled down shortly after it was formed.

A．Right
B．Wrong
C．Not mentioned
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单项选择题
The word detected in paragraph 3 could be best replaced by
A．cured.
B．removed.
C．discovered.
D．caused.
单项选择题
A．kept B．involved C．found D．helped
A．kept
B．involved
C．found
D．helped
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