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【单选题】
People often recall having felt chilled before the onset of a cold. This supports the hypothesis that colds are, at least sometimes, caused by becoming chilled; it is the chill that allows a rhino virus, if present, to infect a person. Which of the following, if true, most seriously weakens the force of the evidence cited above?A.
Being chilled is a form. of stress, and stress lowers the defenses of a person' s immune system, which guards against infection.
B.
After a rhino virus has incubated in a person for several days, the first symptom it causes is a feeling of chilliness.
C.
People who are tired and then become chilled are more likely to catch severe colds than are people who are chilled without being tired.
D.
Some people who catch colds are not sure what it was that allowed them to catch cold.
E.
Rhino viruses are not always present in the environment, and so a person could become chilled without catching a cold.
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举一反三
【单选题】莫泊桑的中篇小说《羊脂球》中的拉马东先生是一个( )
A.
极端自私的末代贵族
B.
具有爱国主义精神的下层人物
C.
善于投机钻营的资产阶级政客
D.
心胸狭隘的教会人士
【单选题】下列各分子中,偶极矩不为零的分子为...................................................( (C) ) (A) BeCl 2 (B)BF 3 (C) NF 3 (D)CH 4
A.
BeCl 2
B.
BF 3
C.
NF 3
D.
CH 4
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