单项选择题

A．Helping the needy to survive.
B．Sharing risks of possible losses.
C．Being compulsory in most countries.
D．Covering differently according to different situations.
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单项选择题
A．Everyone understands Einstein’s theory today.B．Einstein achieved more than any other scientists in history.C．The Theory of Relativity can be quickly learned by everyone.D．Our ideas about the universe are different today because of Einstein.
A．Everyone understands Einstein’s theory today.
B．Einstein achieved more than any other scientists in history.
C．The Theory of Relativity can be quickly learned by everyone.
D．Our ideas about the universe are different today because of Einstein.
填空题
The passage gives a general description of the benefits and potential problems of a hydrogen economy.
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