某工程网络计划共有10项工作,其中A工作为起始工作,其紧后工作为B,B工作的紧后工作为C,持续时间分别为3天，4天，4天,B工作的总时差为2天,则B工作的最迟开始时间为()。
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We may face a severe worldwide water shortage in the future because ______.
A. some of it has been polluted
B. the small amount of fresh water is constantly being replaced by rainfall
C. our need for fresh water is increasing rapidly
The most appropriate title for this passage would be______.
American Newspapers: Gone with the Wind
B. American Newspapers: A Thriving Business
C. American Newspapers: A Hopeless Story
D. American Newspapers: Struggling for Survival
Serving the same food to the same people at different parties might be a good idea.
A. Right
B. Wrong
C. Doesn't say
Were it not for the debt, we ______a happy life:
A. are living
B. would live
C. were living
D. will live
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