问题 选择题

一对表现正常的夫妇生了3个白化病小孩和1个正常的小孩,下列说法不正确的是:[     ]

A.父母双方都是杂合体

B.这对夫妇再生一个小孩为白化病的概率是1/4

C.白化病为隐性性状

D.本题的3:1正好符合孟德尔分离规律的分离比

答案

答案:D

阅读理解

阅读理解。

     Today people can use the phone to talk with others almost anywhere on earth. But when you use the

phone, you don't see the person you are talking with. This may change in the near future.

     Today some people are using a kind of telephone called the picture phone or vision phone. With it, two

people who are talking can see each other.

     Picture phones can be useful when you have something to show to the person you're calling. They may

have other uses in the future. One day you may be able to ring up a library and ask to see a book. Then you'll

be able to read the book right over your picture phone. Or you may be able to go shopping through your

picture phone. If you see something in the newspaper that you think you want to buy, you'll go to your phone

and call the shop. People at the shop will show you the thing you're interested in right over the phone. You'll be

able to shop all over town and never even leave your room!

1. Today people can use the phone to talk with others _____.

A. in all the towns

B. in some places in the world

C. only in big cities

D. almost anywhere on earth

2. The underlined word "it" in the passage means _____.

A. the picture phone

B. any phone

C. the use

D. the change

3. We can _____ through the picture phone according to (根据) the text.

A. write a book

B. do shopping

C. play games

D. have classes

4. Picture phones can be used for _____.

A. ringing up a library to see a book

B. going shopping without leaving our homes

C. showing the person we're talking with something

D. All of the above

5. The title of the article can be "_____".

A. The telephones

B. Picture phones

C. Shopping on the phone

D. Talking on the phone

单项选择题