100 years ago ,80% workers produced goods today only about 20% do.
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With the development of science and teachnology more and more people are leaving longer and longer.
A. 对
B. 错
Organic farming is better _ the environment
A. for
B. at
C. in
D. on
We have no right to consume happiness _producing it.
A. without
B. on
C. in
D. off
Micheal has already spent considerable amount of money.
A. 对
B. 错
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