An airplane has wings （) a helicopter has not.

amic problems. Which of the following effects would you expect？

A.As ice builds up on the top of the wing, drag increases.

B.As ice builds up on the top of the wing, lift increases.

C.As ice builds up on bottom of the wing, lift decreases.

D.All of the above

A、Reduce the wing’s lift upon landing

B、Increase the rate of decent without increasing aerodynamic drag

C、Aid in longitudinal balance when rolling an airplane into a turn

A.A.successful

B.B.on airplane a lot

ernating red and white quadrants，located at each side and end．You inspect the barge and find slight traces of water in the wing voids due to condensation．What should you do？

A.Refuse to accept the barge until all wing voids are dry

B.Accept the barge and when weather conditions permit run with the wing voids open to ventilate the spaces

C.Accept the barge and periodically check the wing voids

D.Return the barge to the fleet and depart without the barge

A.Generally, at what time of the year does the shipping channel get frozen？

B.For what purpose do you think the ban has been issued？

C.Sorry for my boldness, why do you go for the right wing？

D.Maggie, how did you feel about the change by way of the Internet economy？

All of following questions are called open-ended questions EXCEPT that ________.

A.for what purpose do you think the ban has been issued？

B.Maggie, how did you feel about the change by way of mobile payment？

C.sorry for my boldness, do you go for the right wing？

D.Generally, when does the shipping channel get frozen？

ments as a further assurance of the ability of the airplane to perform. within the limits of the original certification.（）

A．编制CAP的目的是延伸目前的检查要求，以进一步保证飞机在初始认定范围内的性能

B．编制CAP的可以提高目前的检查要求，以进一步保证飞机在初始认定范围内的性能

C．编制CAP的目的是延伸目前的检查要求，以进一步提高飞机在初始认定范围内的执行能力

al development tools has(66)in tandem with Windows itself. These tools create beautiful windows wing(67)and their fast development cycles and easy learning curves make them a good(68)for many types of PC development projects. Today's developers are leveraging these tools and the abundance of cheap, powerful PCs to shift the balance of power to the desktop. As the world moves inexorable toward Window and other(69). user interfaces, developers can choose from an abundance of(70)oriented tools. Popular examples include Microsoft Corp's Visual Basic, powersoft Corp's PowerBuilder, Gupta Technology Corp's SQL Windows, and so on.

A．rise

B．risen

C．rised

D．rising

gnetic levitation vehicles, according to a report by Argonne National Laboratories. But before "maglev" vehicles can become commercial successes, the report says, people need to stop thinking of them as high-speed trains. Instead, consider them low-flying aircraft. Argonne contends that maglev vehicles will be best suited to replace commuter aircraft. Plane flights under 600 miles are the least energy-efficient, and maglev "planes" should cut these fuel needs by up to 75 percent. Reportedly, the money saved by a 2,000-mile maglev network linking major cities world more than pay for its construction in 20 years. The quiet purr of levitating crafts would also be a balm for neighborhoods tormented by the roar of conventional takeoffs and landings. The technology behind magnetic levitation is already well understood, the report notes. The West Germans and the Japanese already well understood, the report notes. The West Germans and the Japanese have several full-scale working models. Meanwhile, research in the United States has lapsed.

What is the best title for this passage？

A．The Future of Transportation

B．Argonne Develops Maglev Train

C．The Disadvantages of Commuting by Airplane

D．Commuting in the Future

g all kinds of innovation. It should be【C1】______ also that technological innovations have【C2】______ the character of war itself by the【C3】______ of new mechanical and chemical devices. One weapon developed【C4】______ World War II deserves a special mention. The【C5】______ of rocket propulsion (推进力) was wellknown earlier, and its possibilities as a 【C6】______ of achieving speeds sufficient to escape from the Earth's gravitational (引力的) pull had been【C7】______ out by the Russian and the American scientists. The【C8】______ built an experimental liquid-fuelled rocket in 1926.【C9】______ , a group of German and Romanian pioneers was working across the same lines, and in the 1930s, it was this team that developed a rocket【C10】______ of delivering a warhead hundreds of miles away. Reaching a height of over 100 miles, the V-2 rocket【C11】______ the beginning of the Space Age, and members of its design team were【C12】______ in both the Soviet and United States space programs after the war. Technology had a tremendous social【C13】______ in the period 1900—1945. The automobile and electric power, on the other hand, radically changed both the scale and the quality of 20th-century life,【C14】______ a process of rapid urbanization and a virtual revolution【C15】______ living through mass production of household goods and【C16】______ . The rapid development of the airplane, the cinema,【C17】______ radio made the world seem suddenly smaller and more【C18】______ . The development of many products of the chemical industry further transformed the life of【C19】______ people. In the years following 1945 the constructive and creative opportunities of modern technology could be exploited,【C20】______ the process has not been without its problems.

【C1】

A．observed

B．notified

C．commented

D．detected