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【单选题】
发表偏倚是指A.
研究者往往根据需要自定一个纳入标准来决定某些研究的纳入与否
B.
世界上几个主要的医学文献检索库绝大部分来自发达国家，发展中国家比例很小
C.
有“统计学意义”的研究结果较“无统计学意义”和无效的研究结果被报告和发表的可能性更大
D.
研究结果的筛选过程中筛选者主观意愿的影响而引入的偏倚
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【单选题】听力原文：This is an announcement for passengers of Paraguay Airlines flight PA603 to Sao Paolo. This flight will be delayed due to poor weather conditions. Passengers are requested to report to the transi...
A.
Staff of Paraguay Airlines
B.
Passengers of flight PA603 to Sao Paolo
C.
Guests at the Cucaracha Hotel
D.
Families only
【单选题】U.S. airlines could slash 70,000 more jobs if there were war with Iraq and the U.S. government did not give the industry, more help, the biggest domestic carriers said on Tuesday. The Air Transport As...
A.
the industry would have to lose $180 million revenue each year with one gallon of jet fuel increasing one penny on sale
B.
the overall traffic volume is expected to drop at least over eight percent, which took place during the first gulf war
C.
the U. S. government refuses to give the main airline companies any essential financial sup- port once the war broke out
D.
it would take a few years to get the prewar ticket prices resumed and then to spur the passengers' riving demand
【单选题】U.S. airlines are allowed to overbook flights to ______ "no-show" passengers.
A.
greet
B.
admit
C.
admit for
D.
allow for
【单选题】U.S. airlines provide compensation only when a passenger is involuntarily bumped. ______ this limitation, they will still offer something for the troubles.
A.
Though
B.
Even if
C.
In spite of
D.
Due to
【单选题】If you don’t know the answer to something, you say: “______”
A.
Sorry, I don’t understand.
B.
I’m sorry. I don’t know.
C.
Can I speak English?
D.
Excuse me. How do you say that in English?
【简答题】U.S. airlines are seeing a major interruption because of hundreds of flights canceled due to the ash cloud from the Icelandic volcano, but European flight companies will face the biggest losses. The a...
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