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The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences
The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences
admin
2011-01-26
37
问题
The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences in their resistance. The tubercle bacillus is one of the more resistant, and vibrio cholcra is one of the more sensitive to drying In general, the encapsulated organisms are more resistant than the non-encapsulated forms. Spores are quite resistant to drying; the spores of the anthrax bacillus, for example, will germinate alter remaining in a dry condition for years or more. The resistance of the pathogenic forms causing disease of the upper respiratory tract is of particular interest in connection with airborne infection, for the length of time that a droplet remains infective is a result, primarily, of the resistance of the particular microorganism to drying.
According to the passage, the risk of infection from airborne microorganisms would likely be greater during a ______.
选项
A、heat wave
B、time of high humidity
C、windless period
D、shortage of fuel oil
答案
B
解析
文章一开头就交代了细菌在干燥的空气中难以存活“The vegetative forms of most bacteria are killed by drying in air,”反之,潮湿的空气下,其较易存活,传染性也就越强。A条件下,不利于其生存;C,D条件文中未提到。
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0
考博英语
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