问题 单项选择题

下图为某一遗传病的家系图,已知Ⅰ1为携带者。可以准确判断的是()

A.该病为常染色体隐性遗传

B.Ⅱ4是携带者

C.Ⅱ6是携带者的概率为1/2

D.Ⅲ8是正常纯合子的概率为1/2

答案

参考答案:B

判断题
阅读理解

阅读理解。

     This is News on the Hour, Ed Wilson reporting. The president and First Lady will visit Africa on a good

will tour in May. They plan to visit eight African countries.

     Reports from China say the Chinese want closer ties between China and the U.S. and Western Europe.

A group of top Chinese scientists start its ten-nation tour next month.

     In news about health, scientists in California report findings of a relationship between the drinking of coffee

and the increase of heart diseases among women. According to the report in the American Medical Journal, the

five-year study shows that: women who drink more than two cups of coffee a day have a greater chance of

having heart disease than women who do not. That's the news of the hour. And now back to more easy

listening with Jan Singer.

1. To improve the ties between China and the U.S. and Western Europe, ______.

A. China has expressed its strong wishes

B. China has given many reports to improve the ties

C. China will send some scientists to visit the U.S. only

D. some Chinese scientists will visit the U.S. and Western Europe

2. The news about health tells us that ______.

A. no one should drink more than two cups of coffee a day

B. no heart disease will be found if people don't drink coffee

C. women's heart disease has a lot to do with their drinking coffee

D. the more coffee people drink, the more chance they'll get to have heart disease

3. The passage is probably from ______.

A. a book

B. a radio station

C. a diary

D. a Medical Journal