Eye doctors in Shanghai found out that the nearsightedness among primary and middle school students has something to do with the colour of the paper in their textbooks and notebooks．

　 The doctors suggested that yellow paper will be used to replace the white one．According to

their research，the experts found out white paper reflects too much light and easily tires a person’s eyes．The yellow paper，however，doesn’t look so sharp to a person’s eyes．In other words，it is much milder to the eyes of students who may do reading or writing for hours．

The experts’research findings were based on first．hand information and a number of scientific experiments including a new study among the students from forty-one middle schools．To make the students understand the truth，Shanghai Education Development Co．Ltd．has produced textbooks and exercise．books made of yellow paper．The books will be used in the whole city soon．

(　 )49．What does the word“replace”here mean in Chinese?

　　　 A．放置　　　　 　B．重置　　　　 C．替代　　　　 D．发生

(　 )50．The doctors found out_________ caused the students’nearsightedness．

　　　 A．their studies have　　　　　　　　 B．the colour of the paper has

　　　 C．the textbooks and notebooks have　　 D．the colour of their clothes has

(　 )51．Why does white paper easily make our eyes tired?

　　　 A．Because white paper reflects too much light．

　　　 B．Because white paper gets in too much light．

　　　 C．Because white paper is always shining．

D．Because white paper is too bright．

　　One day he went to see his grandmother in a small town by car. He was driving his car along a dark street when he saw two men attacking （攻击）a young woman. Mr Brown stopped his car at once and rushed out to help the woman. “Get in my car, ”he shouted to her. “Drive to the police station. Quick! ”

　　Ten minutes later, the policemen came. They found the two men had gone away and Mr Brown was lying on the ground. He was black and blue all over（浑身上下遍体鳞伤）.

　　One of the policemen knew Mr Brown. He said, “Why, this is Mr Brown, our great boxer! ”“Why didn't you fight back but let them hit you like this? ”asked the policeman to Mr Brown. “You are strong enough to hit four of them with your fists! ”“But I haven't got my gloves（拳击手套）on, ”answered Mr Brown.“A boxer must never go to fight without his gloves on. That's one of our rules. ”

（　）1. Where did the story happen（发生）? It happened ________ .

A. at the police station　　　　　　　　　　　　　　　　　　  B. in a city

C. in a street　　　　　　　　　　　　　　　　　　　　　　　　    D. at his grandmother's

（　）2. When he saw two men attacking a young woman, Mr Brown ________ .

A. drove to the police station　　　　　　　　　　　　　　 B. got out of his car and helped her

C. stopped his car and shouted　　　　　　　　　　　　  D. lay down on the ground

（　）3. When the policemen came, they found Mr Brown ________ .

A. was badly hurt　　　　　　　　　　　　　　　　　　　　    B. was a great boxer

C. was fighting the two men　　　　　　　　　　　　　　 D. was helping the young woman

（　）4. He didn't fight back because ________.

A. he wasn't a good boxer　　　　　　　　　　　　　　    B. the two men were much stronger than him

C. he could hit four of them　　　　　　　　　　　　　　  D. he had to obey（遵守）the boxing rules

（　）5. One of the boxers' rules is ________.

A. to fight with the gloves on　　　　　　　　　　　　    B. to fight without the gloves on

C. to fight with strong fists　　　　　　　　　　　　　　   D. to fight four men

根据所给中英文提示，写出语法正确，意思联贯符合逻辑的文段。所给的英语提示词必须都用上。

中文提示：

　　一天小明沿着河边散步，突然听到有人在呼救。当时发生了什么呢？小明又是怎样做呢？他如此……以至于大家都想……

　　1．one day, have a walk, river

　　2．suddenly, hear, somebody, call,“Help! Help!”

　　3．a girl, fall, river, and, too young, swim

　　4．jump, save the girl, without, take off, clothes

　　5．brave(勇敢), everyone, want, learn, he