题目内容
A including car-rental and sight-seeing services.
B so that in a short time agents can obtain first-hand knowledge of the tours.
C in preparing effective advertising campaigns
D as a result tourism is flouring in all countries
E hotels rely upon agencies
F to explain destinations
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请选择（6）处的最佳答案。
指出阴邪所致疾病性质的是E．
How did the researchers test their volunteers？
A By giving everyone nasal drops containing either a cold virus or a particular flu virus.
B By giving everyone a medicine that help lessen the probability of catching cold.
C By giving everyone an injection boosting immune function.
D By investigating everyone’s characteristics, interests and hobbies.
Which of the following is NOT true of traditional university research？（）
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