单项选择题

Which is not a significant difference between manufacturing and service operations？（）

A.cost per unit
B.uniformity of output
C.labor content of jobs
D.customer contact
E.measurement of productivity

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单项选择题

In some European nations，the working people may face much higher taxes because（）.

A.the nation needs more and more money
B.the retired people become more and more
C.the number of deaths becomes more and more
D.the working chances become more and more

单项选择题

China has cut its rate of population growth by（）since 1970.

A.50%
B.75%
C.150%
D.1.5%

单项选择题

Which of the following is not mentioned in the passage as a reason for birth rate drop？（）

A.More men and women marry late.
B.More women are going to work.
C.More governments support family planning.
D.More men and women decide to remain single.