单项选择题

Hill slopes are cleared of forests to make way for crops, but this only ______the crisis.

A．precedes
B．prevails
C．ascends
D．accelerates
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单项选择题
Although a teenager, Fred could resist______ what to do and what not to do.
A．being told
B．telling
C．to be told
D．to tell
单项选择题
Many types of rock are __ from volcanoes as solid, fragmentary material.
A．ejected
B．injected
C．propelled
D．flung
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