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.
19（）
A.obtained
B.produced
C.earned
D.inherited
参考答案：D
解析：
[试题考点] 上下文语意关系和动词词义辨析。
[解题思路] 本题空格所在句句意为“母乳喂养引起的智力提升只发生在那些______至少一个C类基因副本的人身上”，空格处要填一个动词，连接逻辑主语people和宾语one copy of the C variety。很显然，此处意在表达“遗传了C类基因副本的人”，故选项[D]inherited(因遗传而获得)正确。
[干扰排除] 选项[A]obtained意为“(通过努力)获得”，选项[B]produced意为“制造；生产”，选项[C]earned意为“赚得；挣得”，这三项都不能与宾语one copy of the C variety搭配，故排除。