单项选择题

Does brain power ______as we get older Scientists now have some surprising answers.

A．descend
B．decline
C．deduce
D．collapse
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单项选择题
Although Anne is happy with her success she wonders ______ will happen to her private life.
A．that
B．what
C．it
D．this
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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