The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.
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A
limit
B
lack
C
need
D
demand
推荐题目
Mrs Read went to the market and bought several ______ eggs. 
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A
dozen of
B
dozens
C
dozen
D
dozens of
30. Having introduced the advanced scientific methods, the factory turned out ______ in 2006 as a year before.
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A
as many as four times machines
B
four times machines as many
C
four times as many machines as
D
four times as many machines