问题 问答题 简答题

试述心的结构。

答案

参考答案:

心主要由心肌组成,是连接动脉、静脉的枢纽和心血管系统的“动力泵”并且具有重要的内分泌功能。

心内部被房间膈和室间隔分为互不相通的左、右两半,每半又分为心房和心室,故心有四个腔:左心房、左心室右心房和右心室。同侧心房和心室借房室口相通。心房接受静脉,心室发出动脉。在房室口和动脉口处均有瓣膜,它们颇似泵的阀门,可顺流而开启,遇逆流而关闭,保证血液定向流动。

阅读理解

阅读理解。

     There are  many kinds  of cars in  this world.  My grandfather thinks  this  is  because  cars are like

their drivers.  He  says, " Rich people have expensive cars, big people have large cars, and  old people

drive old cars. " But I don't agree with him.

     My neighbor, Mrs Hill,  is 82 years old.  She drives  only  on  Tuesday,  and then she drives only to

the bank. She never drives more than 30 kilometers an hour.  Do you think Mrs Hill has a very old and

small car? No ! Her car is new. It's very large, and it can go 200 kilometers an hour!

     My friend Mike is an artist. He paints  beautiful  pictures  with  lots  of  colors.   But his car is black.

Mrs Bates has a very, very old car. It often has  some trouble.  Does she drive that kind of car because

she is poor? No, she has four restaurants and two million dollars in  the  bank. My  uncle  Joe has a very

small car. Every Sunday, he drives to the country with his wife, his three children, his mother and his dog.

     Now, you have read about my friends and their cars. Do you agree with my grandfather? Maybe

you have a car. Does it say something about you?

1. The writer's grandfather thinks_________.

A. a person has the same kind of car as himself( herself)

B. different people have cars of the same kind

C. poor people have large cars

D. artists have black cars

2. _________ has a very old car.

A. Mrs Hill                      

B. Mrs Bates

C. Mike                        

D. Joe

3. Though Uncle Joe has a very small car, _________ .

A. he has a dog

B. he has a large family

C. he has no children

D. he has few members in his family

4. The writer's friend Mike paints _________.

A. pictures in black

B. colorless pictures

C. colorful pictures

D. pictures with only a few colors

5. The writer thinks__________.

A. his grandfather's idea is right

B. cars are often the same as their drivers in many ways

C. artists shouldn't drive black cars

D. a car doesn't say anything about its owner

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