Why human became naked apes is still a mystery. Explanations range from ease of heatloss to the selection of mates by the quality of their skin. Dr Greaves's study, though,removes any doubt about why a change of skin color was essential.

　　词汇突破：

Homo sapiens 现代人

　　Apes 猿

　　range from…to … 包括…和…

　　though: 两个, ,隔开的though=however

　　remove ：

1.Why human became naked apes is still a mystery.

　　为什么人会变成“裸猿”还依旧是个迷。

　　2. Explanations range from ease of heat loss to the selection of mates by the quality oftheir skin.

　　主干：Explanations range from A to B.

　　A= ease of heat loss

　　B= the selection of mates by the quality of their skin.

　　解释包括，易于散热以及可以通过皮肤的质量来选择配偶。

　　Dr Greaves's study, though, removes any doubt about why a change of skin color wasessential.

　　但是Greaves博士的研究已经使我们不再怀疑，为什么肤色的变化是有必要的。