VI.完形填空：先通读下面短文，掌握其大意，然后从各小题所给的A、B、C、D四个选项中，选出一个最佳答案。共15小题，计15分。

For years scientists have been arguing about whether nature or nurture (后天) decides what people will be like. Is it nature— what people are (41)             with— that decides what they will be like? (42)        is it nurture —what(43)            to people when they are born —that decides what they will be like?

Scientists have been studying twins to (44)              if they can find the answer, because twins start out with the (45)              DNA. Sometimes twins don’t live together at birth and grow up in different (46)            and different places— so the nature is the same for both, but the nurture is different.

When scientists (47)              these twins in their later life, they some times find some surprising (48)           .

Jim Springer and Jim Lewis were adopted（收养）by two different families at birth. They first met each other again thirty-nine years (49)              and discovered they had a lot in (50)               .Both had been (51)                   twice. Their first wives were both named Linda and their second wives were both named Betty!

Each twin had a son — one called his son James Alan and the (52)                   called his son James Alan, too. Their children each had a dog called “Toy”. They even arrived at their first (53)               in the same color of car.

So far twin (54)                seem to show that both nature and nurture are important. What we have from birth, and how and where we live help to bui ld (55) we are.

41.A. born              B. grown            C. taught         D. made

42.A. So                 B. And               C. If                D. Or

43.A. pretends        B. happens         C. falls             D. depends

44.A. hear              B. win                 C. see              D. plan

45.A. nice               B. same              C. full               D. free

46.A. families          B. cities               C. countries      D. nations

47.A. believe           B. suggest           C. receive         D. compare

48.A. numbers        B. discoveries       C. results         D. decisions

49.A. ago                B. later               C. forward         D. behind

50.A. common         B. fact                C. danger          D. trouble

51.A. mentioned      B. married           C. succeeded     D. interviewed

52.A. either             B. else                C. other            D. only

53.A. competition    B. education        C. purpose         D. meeting

54.A. studies          B. movies             C. challenges     D. mysteries

55.A. what              B. when              C. where            D. who