单项选择题

Sometimes children have trouble ______fact from fiction and may believe that such things actually exist.

A．to separate
B．separating
C．for separating
D．of separating
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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
单项选择题
The person who______ this type of approach for doing research deserves our praise.
A．generated
B．originated
C．speculated
D．manufactured
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