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[单选] More has been learned since 1945 about the chemical changes in the body than in all human history before ________time．
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[单选] It is a small country, yet has a lot of________resources．
[单选] I applied for the job that I saw advertised ________the paper．
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[单选] ________had he arrived home than it began to rain．
[单选] The differences between Chinese and western society can________misunderstandings．
[单选] John________he could improve his exam results, but he did not have enough time to study．
[单选] Not only the switches but also the old wiring ________ changed．
[单选] -- How do you like these chairs?-- Yes, they are actually nice but they are not much ________demand now．
[单选] How can he do so much work? He ________stay late at the office every evening and take work home at weekends．
[单选] By the time you arrive, I ________ working for two hours．
[单选] Dreams are often an elegant means of highlighting problems________in the present or the past．
[单选] It is often easier to make plans than to ________them out．
[单选,材料题] The author tends to think that the fifth level________
