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Which of the following is true about the immunity to HIV?
Which of the following is true about the immunity to HIV?
admin
2011-01-08
45
问题
Which of the following is true about the immunity to HIV?
About 10 percent of Europe’s present-day population seems to be resistant to HIV -- a significantly higher proportion than on other continents. Researchers have traced this immunity to a genetic mutation that seems to have appeared some 2,500 years ago, and that protects white blood cells against penetration by HIV. From the mid-14th century through the 17th century the prevalence of the mutation increased, in tandem with repeated outbreaks of the plague. The researchers suggest that the mutation protected against the disease, which culled the population of people who lacked it.
选项
A、It is partly resistance to the mutation.
B、More Europeans have it than the people on other continents.
C、It is the result of outbreaks of the plague.
D、It is a mutation that protects white blood cells.
答案
D
解析
掌握篇章结构形成的意义上的内在逻辑,支持性细节往往具体说明或解释主题。
转载请注明原文地址:https://kaotiyun.com/show/AP0O777K
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