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【21】______? The Association of Flight Attendants (AFA), 【22】______which 42, 000 flight attendants with 27 airlines are represented, evidently thinks so. The organization claims that the incidence of air-quality-related diseases has【23】______among its members and demands that prompt actions be【24】______to improve the conditions in the airplane cabin.
    A study the AFA【25】______in 1997 uncovered about 1, 000 self-reported incidents of headaches, dizziness and memory loss【26】______flight attendants and passengers. Some flight attendants were too ill to【27】______their safety duties, while others have been permanently disabled.
    Because of airlines’ efforts to【28】______their expenses, cabin-air filters are not cleaned【29】______. The complaints of flight attendants do not always give【30】______to correct maintenance. Airlines turned to recycled air, 【31】______that they would reduce some of their costs. They are not required to put filters in. Airlines are【32】______great pressure to get their flights out【33】______. So they do not pay as much attention to systems that are not as【34】______to flight schedule and safety.
    Recent research findings emphasize the concern that filters can【35】______engine chemicals into the cabin air. This may not happen【36】______every flight, but it is a persistent problem.
    In a study published in October 1998 an investigation was made【37】______complaints of crew members【38】______air quality and health. More than half of the 200 subjects reported health problems they【39】______to cabin air. It was concluded that these health problems were consistent with【40】______harmful gases and substances.
【34】
选项 A、influential
B、inevitable
C、critical
D、efficient
答案C
解析 influential有很大影响力的，常与介词in连用，表示在某方面有影响力；inevitable不可避免的；critical极重要的，关键的，常与介词to连用，表示对于…来说是极重要的；efficient效率高的。根据该句中的“systems”以及“flight schedule and safety”可以推断出此处要表达的是“对航班时刻表及飞行安全不起关键作用 的系统”，故选C。
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