注意：in modern times, in the old days

17.   【2012四川】We are said to be living in ____ Information Age, ____ time of new discoveries and great changes.
A. an; the  B. 不填; the  C. 不填; a    D. the; a

18.   Scientists hope to send an expedition to Mars during ______.
A. the 1990s     B. the 1990    C. 1990s    D. 1990’s

考点8.     用在by + the+名词结构, 表示 “ 以…..单位计”

The apples are sold by the kilo. 这些苹果按公斤卖

The workers are paid by the hour. 这些工人的工资是按小时计算的.

19.   Apples are usually sold by ______weight, and eggs are sometimes sold by ______ dozen.
A. the; the    B. 不填; a   C. 不填; the  D. the; a

20.   .“How did you pay the workers?”
“As a rule, they are paid ______.”
A. by an your                 B. by the hour    
C. by a hour      &nb

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