问题 选择题

下列哪项最能表示水生和陆生哺乳动物的差别(  )

A.心脏结构

B.繁殖行为

C.运动方式

D.呼吸器官

答案

哺乳动物的心脏四腔,分为左右心室和左右心房,两条循环路线;繁殖方式为胎生(鸭嘴兽为卵生),具有用乳汁来哺乳后代的行为,大大提高了哺乳动物后代的成活率;用肺呼吸;运动方式有行走、跳跃、奔跑和游泳等,陆生哺乳动物一般是行走、跳跃、奔跑等,而水生哺乳动物一般在水中游泳.

故选:C

阅读理解

阅读理解。

     In some countries, some people do not like the number 13.They don't think 13 is a lucky number. For

example. they don't like to live on the l3th floor.

     One day, Jack asks some friends to dinner. When all of his friends arrive, he asks them to sit around the

dinner table. He begins to count the people while they are having the lovely food.Suddenly he cried out (大叫),

"Oh, there are thirteen people here!".

     Everyone's face turns white except (除外) Mr Brown. He says slowly with a smile on his face,"Don't

worry (担心), dear friends! We have fourteen people here.My wife will have a baby in a few weeks."

     All of them become happy again."Congratulations (祝贺)!" they say to Mr and Mrs Brown.Then they

enjoy the nice food and have a good time that evening.

1. Jack asks his friends to _______ that day.

A. stand around the table

B. sit around the table

C. count the people

D. cook the food

2. Jack begins to count the people _______.

A. when the people are eating

B. when they say to him

C. when they come in

D. when they go home

3. Jack doesn't want to have _______ people for the dinner.

A. ten

B. twelve

C. thirteen

D. fourteen

4. Why does everyone's face turn white?

A. Because the food is delicious.

B. Because they like the number 13.

C. Because they don't think the number is lucky.

D. Because it is very cold.

5. All the people _______ when Mr Brown tells them about his wife.

A. are crying out

B. are going home

C. are very happy

D. are very worried.

单项选择题