问题 选择题

以下与减数分裂和受精作用有关的说法中,不正确的是[ ]

A.受精作用的实质是精子的核和卵细胞的核融合,受精作用前后卵细胞的活跃状态不同

B.联会的两条染色体的形态、大小未必相同

C.一个精原细胞经减数分裂形成4个精细胞,每个精细胞的染色体和DNA含量与精原细胞相比都减半

D.人的初级卵母细胞在联会时期含有92条染色单体,四分体时期含有23个四分体

答案

答案:C

完形填空

SECTION B(18分)

Directions: For each blank in the following passage there are four words or phrases marked A,B,C and D.Fill in each blank with word or phrases that best fits the context.

Handshaking, though a European way of greeting people, is now often seen in big cities of China. Nobody knows exactly when the practice  36  in Europe. It is said that long long ago in Europe when people met, they showed their unarmed hands to each other as a sign of   37  . As time went on and trade in cities grew rapidly, people in cities began to clap each other’s hands to make a (an)  38  or to reach an agreement. This was later changed into shaking hands among friends on meeting or   39  each other. “Let’s shake (hands) on it” sometimes means agreement reached.

Do the Europeans shake hands wherever they go and with whomever they meet?   40  . Sometimes the Chinese abroad reach out their hands too often to be   41  . It is really very impolite to   42   your hand when the other party, especially when it is a woman, shows little interest in shaking hands with you and when the meeting does not   43  anything to him or her.   44  , for politeness, he holds out his unwilling hand in answer to your uninvited hand, just touch it slightly. There is generally a misunderstanding among the   45  that westerners are usually open and straightforward, while the Chinese are rather reserved (矜持的)  46  . But the truth is that some people in western countries are more reserved than some Chinese today. So it is a good idea to shake hands with a Westerner   47  when he shows interest in further relations with you.

36.A.came     B.grew     C.turned      D.started

37.A.interest     B.eagerness  C.goodwill   D.patience

38.A.signal       B.noise     C.offer     D.deal

39.A.leaving     B.seeing       C.kissing      D.visiting

40.A.Yes      B.Maybe      C.Well     D.No

41.A.polite          B.kind     C.helpful     D.interested

42.A.hold     B.give     C.shake     D.display

43.A.mean     B.matter      C.count     D.make

44.A.As long as       B.However   C.Even if     D.Therefore

45.A.people      B.Chinese    C.Europeans D.public

46.A.in person  B.in manner C.in harmonyD.in secret

47.A.absolutely B.possibly    C.only     D.definitely

单项选择题