36.What is most remarkable about the proposal,made by the tWO scientists?.
A.It is given a patriotic name.
B.No law of physics is violated.
C.It is based on existing technology．
D.Carbon dioxide Can be converted into fuel
答案：D
37.What is the biggest problem with hydrogen-powered cars?
A．There is no cheap source of hydrogen．
B.There might be a safety problem in hydrogen production．
C．They may still be a cause of global warming．
D．They are not suitable for long-distance travel．
答案：C
38．If what is proposed by the two scientists becomes true,___________________.
A．air pollution will,become a thing of the past
B.there will be no need for gasoline substitutes
C.people will be able to use much cheaper engergy
D．there will be no more biofuel-powered vehicles
答案：B
39.Which of the following Call best describe the attitude of Martin I Hoffert to the proposal?
A．Indifferent． B.Positive.C．Suspicious．D．Critical．
答案：B
40.The passage is mainly written to________________.
A.introduce a newconcept
B．compare different energy sources
C．stress the importance ofgasoline
D．discuSS solutions tO global warming
答案：A