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  3. 　　Everyone knows that the average human body temperature is 37°C—but everyone is wrong. It turns out that the bodies of people i

　　Everyone knows that the average human body temperature is 37°C—but everyone is wrong. It turns out that the bodies of people i

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问题 　　Everyone knows that the average human body temperature is 37°C—but everyone is wrong. It turns out that the bodies of people in the US have been cooling since the 1860s.
　　Physicians studying body temperature have known for decades that 37°C was too high, says Julie Parsonnet at Stanford University in California, "But they’ve always thought that it was just measurement error in the past, not because temperature had actually dropped."
　　To find out what really happened, Parsonnet and her team combined three data sets. The first set covered nearly 24,000 UnionArmyveterans (老兵) from the American Civil War, whose temperatures were measured between 1860 and 1940. The other two ranged from 1971 to 1975 and from 2007 to 2017. In total, the team analyzed more than 677,000 temperature measurements.
　　On average, US body temperature has declined by 0. 03°C per decade. Body temperatures of men born in the early 19th century were 0.59°C higher than those of men today. Women’s average temperature has dropped by 0.32°C compared with that of women born in the 1890s. That means average body temperature today is about 36.6°C , not 37 C as it is widely thought.
　　The change isn’t simply the result of older thermometers(温度计)being unreliable. We know this because the cooling trend is visible within the more modern data sets, in which the thermometers were probably more accurate.
　　"The most likely explanation in my view is that, microbiologically, we’re very different people than we were," says Parsonnet. People have fewer infections, thanks to vaccines and antibiotics, so our immune systems are less active and our body tissues less inflamed(发炎).
The word "it" (Line 2, Para. 2) refers to the fact that_________.
选项 A、37°C was too high
B、37°C was too low
C、37°C was irregular
D、37°C was regular
答案A
解析 本题考查细节。通过题目所给信息，定位到文中第二段的第二行。此类题考查的是代词，考生若要准确理解指代对象，则需继续往上看，联系上下文。根据第二段Physicians studying body temperature have known for decades that 37℃ was too high，says Julie Parsonnet at Stanford University in California，“But they’ve always thought that it was just measurement error in the past，not because temperature had actually dropped．”(研究人体体温的科学家已经知道人体平均体温是37℃的数值太高。来自加利福尼亚州斯坦福大学的Julie Parsonnet说：“但是他们认为这是由于过去的测量错误导致的，而不是体温真的下降了。”)可以得知，it代指的本句中提到的37℃ was too high。故答案选A。
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