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
Where can I find Jim He is ______ his work. He won’’ t leave the lab until 6:00 p. m.
A．on
B．over
C．at
D．under
单项选择题
You have to be ______ when you try to work out mathematical formulas.
A．reasonable
B．rational
C．logical
D．sound
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