Mary is in bed with a fever and she can't hope to ______ the cold in a few days.
A. get over
B. get away
C. get off
D. get out
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对于UPS电源中的逆变器,不是简单地将直流变成交流,尚需实现( )电压的自动调节。
A. 输入
B. 输出
C. 波形
D. 特定
They required that all the necessary documents ______ to the president's office before the end of this month.
A. be handed
B. must be handed
C. should hand in
D. had been handed in
Ever since the family moved to the suburbs last year, they ______ better health.
A. could have enjoyed
B. had enjoyed
C. have been enjoying
D. are enjoying
From the Passage, we learn that the total population of Africa is approximately ()
A. seven hundred million
B. one hundred and twenty-five million
C. eight or eight point five thousand million
D. one hundred million