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完形填空（共15小题,每小题1分，満分15分）
阅读以下短文，从短文后每小题所给的A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
The next generation of airplanes has arrived. They have bigger seats. Their windows are larger. They have more 16 for luggage. And they are coming to an airport near you.These 17 airplanes, such as the Boeing 787 Dreamliner or Bombardier C Series, are more comfortable for passengers. They also 18 the environment. By using less fuel, they will create less 19 . Airline companies are excited, but scientists wonder if the airplanes，designers could do even more.
The 20 to using less fuel is less weight. Therefore, these new planes are made of light materials. They are mostly made up of carbon fiber, a very light 21 strong plastic. Unlike older planes, they do not contain much 22 metal. As a result, they require 20 to 25 percent less fuel than similarly sized older planes.
Some people, however, are still not 23 They say that the new airplanes only produce 20percent less pollution. "We need to go further than that, " says transport expert Geoff Hoon. Experts like Hoon hope airplanes will one day use only biofuel. Unlike 24 fuel made from oil, biofuel is made from 25 , like corn or sugarcane. Scientists believe that the use of biofuel will produce less air pollution. Studies show that biofuel produces half the carbon dioxide of oil-based fuel.
Some scientists also 26 the new airplanes' design. Although they 27 less, the Dreamliner and C Series still look like regular planes. And for the last fifty years, the 28   of airplanes hasn't changed much. Scientists say that 29 planes with a new shape could save much more weight and fuel. One idea is to make planes that look like a very large single wing. Another is to create planes in the 30 of a flying saucer. The round shape of a flying saucer, scientists say would use half the fuel of modern planes.
16. A. seats B.space C. time D. flights
17. A. normal B.outdated C. imagined D. new
18. A. worsen B.contaminate C.benefit D.control
19. A. profit B.protection C.pollution D.promotion
20. A. secret B.journey C.goal D.entrance
21. A. as B. or C. than D. but
22. A. heavy B.precious C. rare D.strong
23. A. surprised B.satisfied C. determined D. worried
24. A. unique B.solid C. regular D.nuclear
25. A. vegetables B.grains C. fruits D.plants
26. A. complain about B.subscribe to C. insist on D. sweep aside
27. A. shuttle B. weigh C.accomplish D.convey
28. A. name B.ticket C.design D.airport
29. A. creating B.buying C drawing D.loading
30. A. title B.shape C.place D.position

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