单项选择题

What are the positive aspects of e-world?

A．People can find what they want online
B．They can talk with others even far on the opposite of the planet
C．People’s privacy would be exposed to the public
D．It’s so much fun sharing information online with friends
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多项选择题
在对投资方案进行经济效益评价时，下列五个方案中经济上可以接受的是( )。
A.投资回收期>基准投资回收期
B.净现值≥0
C.净年值≥0
D.内部收益率≥基准收益率
E.投资收益率≥0
单项选择题
Ammonia is a nitrogenous waste product of protein metabolism, and is harmful especially in high concentrations in the human body. Urea cycle is a means to detoxify and to prevent the accumulation of ammonia in the body by converting it to urea, and eventually excreted in the urine. How many moles of nitrogen enter the urea cycle in every turn? A.0B.1C.2D.3E.6
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