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【单选题】
绿色化学的核心是利用化学原理从源头上减少和消除工业生产对环境的污染。最理想的“原子经济”就是原子利用率为100%。下列制取有机物的反应中原子利用率最低的是A.
nCH 2 = CH 2
B.
CH 2 = CH 2 +HCl CH 3 CH 2 Cl
C.
C 6 H 12 O 6 2C 2 H 5 OH+2CO 2
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举一反三
【简答题】I’m glad to see that you ________ a lot of progress since I ________ you last.A. will make; have met B. have been ; met C. had made; met D. have made; meeting
【单选题】I’m glad to see that you have had everything under control.
A.
很高兴看到你已使一切恢复正常。
B.
很高兴你在控制下完成了每件事。
【单选题】—I’m glad to see that the government has______ the open space _____a public library. —Me, too. We can do some reading there.
A.
moved; into
B.
grown; into
C.
turned; into
D.
put; into
【单选题】I’m glad to see that you a lot of progress since I you last
A.
will make;have met
B.
have made;met
C.
had made;met
D.
have made;meeting
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