1. 【答案】C推理题。文章的第一句“If you are like most people, your intelligence varies from season to season .”已经点出了本文的中心大意。
2. 【答案】B推理题。第一段最后一句“that climate and temperature have a definite effect on our mental abilities”，其中你要理解definite的意思“一定的”，就可以找到答案。
3. 【答案】B细节题。“concluded from other men’s work and his own among peoples in different climates”，从该句可以得知亨廷顿的结论是建立在他人和自己的研究基础之上的。
