A-A+
In paragraph 2 the author explains the concep
问题详情
In paragraph 2, the author explains the concept of vasodilation and vasoconstriction by
A．describing the evolution in our ancestors
B．giving an example of heat loss in the extremities
C．comparing the process in humans and animals
D．identifying various types of insulation请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
解析："For example, heat loss from a human is reduced when arms and legs cool." Choice A is not correct because goose bumps, not heat loss in the extremities, is a vestige of our evolution. Choice C is not correct because no direct comparisons of these processes are made in the paragraph. Choice D is not correct because the types of insulation are mentioned before the concept of vasodilatation and vasoconstriction are introduced.
