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D. the inefficiency of air travel and methods to deal with it 

47. From paragraph 2 of this passage we learn that _________ . 

A. air transport will soon slow down due to the increase in air accidents. 

B. air transport will give rise to greenhouse gas emission in the future 

C. governments and international bodies are active in protecting the environment 

D. aviation will grab a bigger share of international transportation 

48. Which of the following is not considered as a factor leading to more serious greenhouse gas emission by planes? 

A. Emission from international flights has already been banned. 

B. World Summit in Johannesburg didn’t produce a more efficient solution. 

C. The 1994 international treaty banned taxing jet fuel. 

D. Passengers pay little attention to environmental problems caused by long-haul flights. 

49. Paragraph four tells us that ________． 

A. the efficiency of jet planes will offset the growth in passengrs  

B. Boeing’s Sonic Cruiser will be less efficient than planes today 

C. many European governments think that it is unwise to tax jet fuel 

D. the aviation industry has some influences on some powerful bodies  

50. Why is the aviation industry reluctant to curb plane trails? 

A. Because it may increase the total costs of air flights. 

B. Because they have no other way to dump the waste water. 

C. Because flying lower may cause more serious environmental problems. 

D. Because customers do not like the idea of flying lower.

Passage Five

51.   What does the first paragraph of this passage imply?

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