单项选择题

If one wants to work more efficiently at his low point in the morning, he should （）

A. change his energy cycle

C. get up earlier than usual
B. overcome his laziness

D. go to bed earlier

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单项选择题

By referring to Sam’s broken bicycle, the author intends to （）

A．illustrate the ways to repair his bicycle
B．discuss the problems of this bicycle
C．tell us how to solve a problem
D．show us how simple it is to repair a bicycle

填空题

57（）