[单选题]
Which fluid acts as a coo:pe/ dwc87 afe:5 nu3zks 9svnlant in t-. up lk dpij;sw0i n1l+7esr3he human body?
A. Tears
B. Sweat
C. Urine
D. Saliva
参考答案: B
本题详细解析: Sweat (Choice B) is a coolant and helps to cool the body. Tears (Choice A), urine (Choice C) and saliva (Choice D) do not lower or raise the body temperature.
