单选题Which of the following is true about the immunity to HIV?AIt is partly resistance to the mutation.BMore Europeans have it than the people on other continents.CIt is the result of outbreaks of the plague.DIt is a mutation that protects white blood cells.
单选题
Which of the following is true about the immunity to HIV?
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.
参考解析
解析：
逻辑关系的找寻和判断。录音开头便指出当前欧洲大约10％的人口对HIV具有免疫力，接着提到研究发现这种免疫力来自a genetic mutation…that protects white blood cells against penetration by HIV，表明这种基因变异可起到保护白血球免于HIV的穿透的作用。由此可知，选项D与录音相关内容表达意思相符。
【录音原文】
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 l7th 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.
逻辑关系的找寻和判断。录音开头便指出当前欧洲大约10％的人口对HIV具有免疫力，接着提到研究发现这种免疫力来自a genetic mutation…that protects white blood cells against penetration by HIV，表明这种基因变异可起到保护白血球免于HIV的穿透的作用。由此可知，选项D与录音相关内容表达意思相符。
【录音原文】
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 l7th 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.
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