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.
【31】
选项 A、confided
B、promised
C、ensured
D、convinced
答案D
解析 confide(向某人)吐露(隐私、秘密等)；promise承诺；ensure确保；convince使确信。从语意上来看，可排除A；从句子结构上来看，这里是过去分词短语作原因状语，B项不符合；文中句子的意思是，航空公司诉诸可循环空气，因为他们确信(通过这种方式)可以降低部分成本，ensure常用于主动语态中，convince常用搭配为convince sb．／yourself of sth．，如：I’d convince myself (that)I was right．故选D。
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