问题 选择题

儿童少年时期应注意坐立行的正确姿势,否则易引起脊柱变形(   )

A.有机物含量超过

B.有机物含量不到

C.有机物和无机物的含量相等

D.骨中有机物超过

答案

答案:A

题目分析:骨的物理特性包括硬度和弹性两个方面,而骨的硬度和弹性又取决于骨内有机物和无机物的含量之比,成年人,骨内的有机物约占1/3,无机物约占2/3,这样的骨既坚硬又有弹性,而老年人,骨内的无机物大于2/3,这样的骨弹性小,易骨折,少年儿童骨的有机物多于 1/3,骨的弹性大,易变形,青少年若长期不注意坐姿,脊柱就会变形,从而造成驼背,选A。

阅读理解

I want to tell you a story that changed my life many years ago. We were living in College Station, Texas and my wife and I were on our way home from Houston, Texas one Saturday morning. We decided to stop at a local restaurant to get something to eat since we had enough time. When we finished, we got back into our car and before I started it, we noticed a homeless man standing in front of the building. His clothes were worn and it looked as though he didn’t have any money. It was cold and I was sure he wanted something warm to drink; however, it was not this that I remember, because that is not what "moved" me. A dog was also walking up to the front of the building. Being a dog owner, I knew that the dog was a mother, and that she had just had some pups (小狗). She was hungry and weak and I felt bad for her. I knew if she didn’t eat soon, she and her pups would not live. People walking by didn’t even notice her. She was not as pretty and clean as most dogs, but she still deserved (值得) better. We still did not do anything, but someone else did. The homeless man, who I thought could not afford anything to eat, went into the store and bought dog food with all the money he had.

小题1:Where did the story happen?

A.In front of the local restaurant.

B.In front of a building.

C.In the car parking lot.

D.Near the author’s house.小题2:What do we know about the dog?

A.The author wanted to help the dog, but he was un-able to.

B.The dog and her pups were in danger of dying from hunger.

C.The dog was not cute enough to be loved.

D.The author didn’t like dogs.小题3:Which of the following moved the author?

A.The homeless man had no money to buy food for himself.

B.The homeless man wore worn clothes on cold days.

C.The homeless man bought food for a dog with all his money.

D.Most people walking by the dog didn’t notice her.小题4:What can we conclude(得出结论) from the passage?

A.The author was so hungry that he went into the local restaurant to eat.

B.The author didn’t understand what the homeless man did.

C.The dog shouldn’t be taken care of carefully because it looked ugly.

D.Things are not always what they seem.小题5:Which of the following would be the best title for the passage?

A.My Memory

B.A Poor Dog

C.The Homeless Person

D.A Mother Dog

单项选择题