Passage Three
Are some people born clever, and others born stupid?Or is the development of intelligence dependent on environment and experience?Strangely enough, the answer to both questions is yes. To some extent, our intelligence is given us at birth. On the other hand, [33]a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings.
It is easy to show that intelligence is something we are born with.The closer the blood relationship between two people, the closer they are likely to be in intelligence. Therefore if we take two unrelated people at random from the population, it is likely that their degree of intelligence will be completely different.If we take two identical twins, they will very likely be as intelligent as each other. [34]Relations like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.
Imagine that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We would soon find differences in intelligence development, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that [35]people who live in close contact with each other, but who are not related at all, are likely to have a similar degree of intelligence.

Questions 33 to 35 are based on the passage you have just heard.
33. What degree of intelligence might a child have, if he lives in a rich and varied environment?
正確答案：A
解析：選項A、B、C中的surroundings, environment和circumstance都有“環境”的意思，所以原文提到environment的時候就要留心。原文說在單調環境下生活的孩子比生活在豐富多彩環境下的孩子智力發展得少，故A正確，A中的dull是對原文中boring的同義替換。
34. Why does the speaker say that intelligence depends on birth?
正確答案：C
解析：原文說兄弟姐妹和父母孩子這類關系的人通常來說智力水平相似，這說明智力依賴血統，故選C。
35. What do we learn about unrelated people who live in close contact according to the passage?
正確答案：D
解析：原文說生活中相互親密接觸、但是并沒有任何關系的人，很可能智力水平相似，故D正確。四個選項中只有D含有原文中出現頻率最高的詞intelligence，僅憑這一點也可以猜測它是正確答案。