Humans are the sweatiest primates on Earth. They have up to 5 million sweat glands,which produce about 12 litres of sweat per day. It's this propensity to sweat that accounts for our hairlessness and has allowed us to thrive. It might help to remember this next time you're surrounded by sweaty hairless torsos in the gym!

词汇表 primates 灵长目动物

bizarre 奇怪的，离奇的

species （动植物的）物种

to ponder 思索，考虑

evolutionist 进化论者

nakedness 裸露

hominins 古人类

sexual selection 雌雄淘汰

ancestor 祖先

hypothesis 假说，假设

hominids 原人

savannah 稀树草原

to hunt 打猎

game 野禽

early human 早期人类

foraging 觅食，搜寻食物

find a mate 寻找配偶

gland 腺

propensity 习性，倾向

to thrive 长得健壮

torso （人体的）躯干

测验与练习 1.  阅读课文并回答问题。

1. True or false? All primates are covered in fur.

2. Who was Charles Darwin?  

3. Why was moving to the savannah a problem for our early ancestors?

4. What is the advantage of having little hair in a hot climate?

5. What link does the author make between hunting meat and human success?

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