2. 外语
  3. Many people who fly at least occasionally have come down with a cold or the flu shortly after disembarking. Is the air in airbor

Many people who fly at least occasionally have come down with a cold or the flu shortly after disembarking. Is the air in airbor

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问题     Many people who fly at least occasionally have come down with a cold or the flu shortly after disembarking. Is the air in airborne commercial jets【C1】______? The Association of Flight Attendants (AFA),【C2】______which 42, 000 flight attendants with 7 airlines are represented, evidently thinks so. The organization claims that the incidence of air-quality-related diseases has【C3】______among its members and demands that prompt actions be【C4】______to improve the conditions in the airplane cabin.
    A study the AFA【C5】______in 1997 uncovered about 1, 000 self-reported incidents of headaches, dizziness and memory loss【C6】______flight attendants and passengers. Some flight attendants were too ill to【C7】______their safety duties, while others have been permanently disabled.
    Because of airlines’ efforts to【C8】______their expenses, cabin-air filters are not cleaned【C9】______. The complaints of flight attendants do not always give【C10】______to correct maintenance. Airlines turned to recycled air,【C11】______that they would reduce some of their costs. They are not required to put filters in. Airlines are【C12】______great pressure to get their flights out【C13】______. So they do not pay as much attention to systems that are not as【C14】______to flight schedule and safety.
    Recent research findings emphasize the concern that filters can【C15】______engine chemicals into the cabin air. This may not happen【C16】______every flight, but it is a persistent problem.
    In a study published in October 1998 an investigation was made【C17】______complaints of crew members【C18】______air quality and health. More than half of the 200 subjects reported health problems they【C19】______to cabin air. It was concluded that these health problems were consistent with【C20】______harmful gases and substances.
【C15】
选项 A、enclose
B、block
C、introduce
D、detect
答案C
解析 enclose(用墙、篱笆等)把…围起来；block堵塞；introduce介绍，传入，引进；detect发现，侦查。根据前面的“filters”以及后面的“engilie chemicals into the cabin air”可以推断出，此处表达的是“过滤器能将发动机中的化学物质传人座舱空气中”，故选C。
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