The first full-scale huge recycling plants ______.
A. have been in existence for 15 years
B. takes 15 years to build
C. can't be built until 15 years later
D. will remain functioning for 15 years
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The reason why the beat generation refused to cooperate with society was ______.
A. they had no interest
B. they found hard to cooperate with it
C. the laws block their way to do so
D. they thought their need was neglected
This passage is mainly about ______.
A. the young Americans
B. the generation gap
C. the education of the young
D. an American social phenomenon
What is the main mason for big cities to build their own recycling plants？
A. To deal with wastes in a better way.
B. It's a good way to gain profits.
C. It's more economical than to dump wastes in some distant places.
D. Energy can be got at a lower price.
某工程项目分部工程双代号网络计划如下图，其关键线路为()。
A. ①-②-④-⑦
B. ①-②-③-⑥-⑦
C. ①-②-③-⑤-⑦
D. ①-③-⑥-⑦
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