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Complete the following sentences with the proper words and expressions. (填单词或短语对应字母)A. seeB. elastic C. interfere with D. eventually E. maintainF. tremendous G. indicated H. damagedI. means J. preferably1) He tries not to let his business ______ his home life.2) The heavy rain has ______ many houses.3) The play became a ______ hit.4) The last 30 years have ______ considerable changes in China.5) She ______ married the most persistent one of her admirers.6) They want to buy a new house, near the sea ______.7) The rules are ______. We can make some new changes.8) He ______ his willingness with a nod of his head.9) He’s hopelessly inefficient, but I suppose he ______ well.10) He is too poor to ______ his family.

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Fill in the blanks according to Text B. (每空填一个单词。一题多空,答案之间用逗号,隔开。)1) By the year 2020, it is estimated that there will be more _____ people than _____ people.2) In the past, people _____ married and _____ married. Divorce was very difficult, expensive and took a long time.3) Many couples, mostly in their twenties or thirties, live together without getting married. They are also called ______ couples.4) Many women in Britain prefer to concentrate _____ their jobs and put _____ having a baby until late thirties.

(1)基因型方差( )属于下面哪种变异量:

A. 可固定遗传
B. 不可固定遗传
C. 包括固定和不固定遗传两方面
D. 两方面都不包括

一对基因杂合体自交n代,则纯合体在群体中的比例为( )。

A. 1-(1/2n)
B. (1/2 )n
C. 1/2n
D. 1-(1/2)n

显性方差 ____ 属于下面哪种变异量:

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