问题 选择题

人体运动大多是通过骨的杠杆运动表现出来的,在人体运动中,作为杠杆和支点的分别是( )

①骨  ②骨骼肌   ③关节   ④血管

A.①②

B.②③

C.①③

D.③④

答案

答案:C

题目分析:在运动中,神经系统起调节作用,骨起杠杆的作用,关节起支点作用,骨骼肌起动力作用,可见,人体完成一个运动都要有神经系统的调节,有骨、骨骼肌、关节的共同参与,多组肌肉的协调作用,才能完成,选C。

解答题
阅读理解

If you do not use  your arms or your legs for some time, they will become weak; when you start using them again, they will slowly become stronger again.Everybody knows that .yet many people do not seem to know that memory works in the same way.When someone says that he has a good memory, he really means that he keeps his memory in practice by using it.

When someone else says that his memory is poor, he really means that he does not give it enough chance to become strong.If a friend says that his arms and legs are weak, we know that it is his own fault.But if he tells us that he has a poor memory, many of us think that his parents are to blame, and few of us know that it is just his own fault.Have you ever noticed that some people can’t read or write but usually they have better memories? This is because they cannot read or write so they have to remember things; they cannot write them down in a little notebook.They have to remember days, names, songs and stories; so their memories are being exercised the whole time.So if you want to have a good memory, learn from these people:Practise remembering.

小题1:One has a poor memory mainly because       

A.his father or mother may have a poor memory

B.he does not use his arms or legs for some time

C.his memory is not often used

D.he can’t read or write小题2:If you do not use your arms or legs for some time,       .

A.you can’t use them any more

B.they will become stronger

C.they become weak and won’t become stronger until you use them again

D.they will become neither stronger nor weaker小题3:Which of the following is NOT true?

A.Your memory works in the same way as your arms or legs.

B.Your memory, like your arms or legs,becomes weak if you don’t give it enough chance for practice.

C.Don’t learn how to read and write if you want to have a better memory.

D.A good memory comes from more practice.小题4:Some people can’t read or write, but they usually have better memories, because       .

A.they have saved much trouble

B.they have saveed much time to remember things

C.they have to use their memories all the time

D.they can’t write everything in a little notebook小题5:Which is the best title for this passage?

A.Don’t Stop Using Your Arams or Legs

B.How to Have a Good Memory

C.Strong Arms and God Memories

D.Learn from the People