Passage 3

31.【答案】D。解析：段落主旨题。第一段中To some extent our intelligence is given to us at birth, ... On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. 为本段的主题句，说的是“在某种程度上说，我们的智力是与生俱来的，……另一方面，一个生长在单调乏味环境里的孩子，其智力发展不如生长在丰富多彩环境里的孩子”，所以D项符合主旨。

32.【答案】C。解析：词义猜测题。根据第一段中less than前后的比较，可知in a boring environment和in rich and varied surroundings是对等关系，即surroundings和environment同义，故选C。

33.【答案】B。解析：推断题。根据第三段中的线索Relatives like brothers and sisters, parents and children, usually have similar intelligence.(像兄弟姐妹，父母和子女这样的亲属总是有相似的智力)，因此可以推断出近亲有相似的智力，所以选B。根据第三段The closer the blood relationship between two people is, the closer they are in intelligence. 可知C项错误;根据该段if we take two unrelated people at random from the population, it is likely that their degrees of intelligence will be completely different. 可知A项错误;根据文章最后一句people who live in close contact with each other, but who are not related at all, are likely to have similar degrees of intelligence. 可知D项错误。

34.【答案】D。解析：细节题。根据最后一段people who live in close contact with each other, but who are not related at all, are likely to have similar degrees of intelligence. 可知那些有紧密联系的人，尽管不是亲属，很有可能有相同程度的智力，所以选D。

35.【答案】A。解析：主旨题。本文的主题就是“论智力”，第一段是全文的主题段，主要讲述了智力水平及发展的决定因素，所以A项符合主旨。

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