The businessmen discussed the contract______but never actually signed anything.
A. at length
B. at sea
C. at random
D. a will
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What did the man learn from the video？
A. Women are under more stress than men.
B. Women have more heart attacks than men.
C. Women who have heart attacks get less care than men.
网络传输是会计数据输出的最基本形式。()
A. 正确
B. 错误
What does the passage mainly discuss？
A. Tobacco's public image will never change.
B. Chloroplast will make tobacco change its social role.
C. Nuclei is more important than chloroplast.
DNA Dilemma is very optimistic.
在不同的账套下，操作员编号是可以重复的。()
A. 正确
B. 错误
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