题目内容

Keeping your laptop _______ all the time will kill its battery faster.

A. made waves
B. plugging in
C. plugged in
D. making waves

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Movie ticket prices have reached an all-time high. ________ some people choose instead to watch movies at home.

A. If anything
B. In the absence of
C. No wonder
D. No doubt

__________ that story book was indeed very popular, but it was not long before the demand declined.

A. To a while
B. Some time
C. Sometime
D. For a while

已知R、S是N上的关系，其定义如下：R={| x,yÎN∧y=x2}，S={| x,yÎN∧y=x+1}。求R-1、RS、SR

证明：若f:A→B和g:B→C是双射，则（gf）-1=f-1g-1