题目内容

According _some studies half of the sevice jobs pay low wages.

A. to
B. for
C. on
D. in

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Let me more _to my next main point.

A. on
B. in
C. at
D. for

you'll get the right training and education first,which is really the best way.

A. 对
B. 错

100 years ago ,80% workers produced goods today only about 20% do.

A. 对
B. 错

With the development of science and teachnology more and more people are leaving longer and longer.

A. 对
B. 错

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