Few scientific fields are as full of risk as that of research into human intelligence. The two questions that (1) over and over again are "is it a result of nature or nurture" and "does race make a difference"
Making (2) comments about the second question can be a (3) move, as James Watson, a co-discoverer of DNA structure, recently found. He suggested that he was " (4) about the prospect of Africa" (5) "all our social policies are based on the fact that their intelligence is the same as ours (white people) (6) all the testing says not really". Such (7) by Dr. Watson are not merely (8) , they are scientifically weird. If the term (9) has any useful scientific meaning, then Africa, the continent where modern humanity began, is most racially diverse. The resulting (10) among the public forced Dr. Watson to leave his laboratory.
(11) , the study of the first question (12) between intelligence and genetics— has some wiser practitioners. One of them, Terrie Moffitt, of King’s College, has just (13) a project judging the relative importance of nature and nurture. Dr. Moffitt’s team (14) the effect on intelligence of breastfeeding, but in a genetic context. Previous studies have shown that breastfed children are more intelligent, (15) about six IQ points, than those given baby formulas.
The team, however, (16) the involvement of a gene called FADS2, which comes in two varieties, known as C and G. The researchers (17) if these two varieties interacted differently with breast milk. (18) on data from two groups of people, they found that the intelligence increase associated with breastfeeding only happened to people having (19) at least one copy of the C variety. The effect did not. (20) on the social classes or IQs of the parents.
1（）
A.happen
B.rise
C.arise
D.arouse
参考答案：C
解析：
[试题考点] 上下文语意关系和动词词义辨析。
[解题思路] 本题空格所在句为修饰questions的定语从句。that指代先行词questions，且在从句中作主语，空格应填入从句的谓语，与questions构成主谓搭配。四个选项中既符合语意要求，又符合语法要求的只有选项[C]。arise为不及物动词，意为“出现；产生”，代入文中意为“反反复复出现的问题”。
[干扰排除] 选项[A]happen意为“出现；发生”，一般指事故、事情、现象的出现与产生，不可与questions搭配。选项[B]rise意为“上升；(数量)增加”，代入文中，不符合文意。选项[D]arouse意为“唤起，激起(感觉、情绪或回应)”，为及物动词，其后需跟宾语，从语法和语意上都不符合原文，故排除。