proposal looked promising but could not evaluate it fully because the details had not been

　　published.

　　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

　　Passage Three

　　In her international bestselling Talk to the Hand,author Lynne Truss.argues that common

　　courtesies such as saying“Excuse me”are practically extinct.There are certainly plenty who

　　would agree with her.

　　Is it really true?We decided to find out by experiments.In dozens of American cities,our

　　reporters performed two experim6rits： “door tests”(would anyone hold one open for them?);and

　　“document drops”(who-would help them retrieve a pile of“accidentally” dropped

　　papers?).Along the way,the reporters encountered all types：men and women of different

　　races,ages，professions,and income levels.

　　While 90 percent of the people passed the door test，only 55 percent passed the document

　　drop.Are people less likely to help others when doing so takes extra effort or time?Not always， he

　　reporters found.Take the pregnant woman who thought nothing of bending down to help us with

　　our papers.Or the woman named Liz who balanced two coffees，her keys and her wallet on a

　　takeout tray with one hand，while picking up papers off the wet pavement with the other.Her

　　reason for helping?“I was there,”shesaid.

　　Overall，men were the most willing to help，especially when it came to document

　　drops.In those，men offered aid 63 percent of the time，compared to 47 percent among

　　women. Of course，men weren’ t entirely democratic about whom they’d help.All of them held

　　the door for the female reporter,and were more than twice as likely to help her pick up fallen

　　papers than they were to help our male reporter.