Every object has weight. But the center of its weight is not always in the middle of the object. If the top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity is high. But if the bottom is heavier, it won’t fall easily. Then we say that its center of gravity is low.
Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).
Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.

【小题1】If the bottom of an object is ______ its top, it will fall over easily.

Every object has weight. But the center of its weight is not always in the middle of the object. If the top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity is high. But if the bottom is heavier, it won’t fall easily. Then we say that its center of gravity is low.

Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).

Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.

1.If the bottom of an object is ______ its top, it will fall over easily.

A. lighter than　　 B. heavier than　　 C. no heavier than　　  D. as heavy as

2.Please point out which box will not fall.

3.The main idea of the passage is _________.

A. why things fall over　　　　         B. a low center of gravity

C. a high center of gravity　　             D. that everything has weight

When you cough(咳嗽) or sneeze, please turn your head away from others and cover your mouth with the full part of your hand. Afterwards, you should say," Excuse me." This is a rule I set for my students.

　　It is so simple, but many kids have never been told to do this. In fact, I notice adults cough and sneeze in public without putting a hand over the mouth. I hate traveling by underground in New York during cold and flu(流感) season, because it is certain that someone is going to stand right behind me and cough or sneeze on my neck.

　　One important thing I point out to the kids is that after they sneeze or cough on their hand, they should wash their hands as soon as possible. Otherwise, they will be passing those germs along to everything and everyone they touch.

　　In order to help the students remember this rule, I tell them about an old story. It says that when you sneeze, evil spirits jump into your body. If you don't cover your mouth, the spirits will enter, but if you cover your mouth, you will keep them out, We say "God bless you" when someone sneezes, and in Germany(德国) you should say "Gesundheit". That means "Good health to you." Both expressions are said that if you didn't cover your mouth in time and the spirits were able to enter your body. The kids love finding out the origins(起源) of these expressions and it encourage them to put the advice to use more often.

71. The writer of this article must be _______ .

　A. a reporter　　　　　　　　　　 B. a teacher　　　　　　　　 C. a doctor　　　　　　　　　　　　 D. an officer

72. What does the underline word 'this" mean?

　A. Don't cough or sneeze in front of people.

B. Don't stand beside someone who coughs or sneezes.

　C. Many people cough or sneeze on the underground train.

　D. Cover your mouth when coughing or sneezing and say sorry.

73. After coughing or sneezing on their hand, students are advised to _______.

　A. say "God bless you" B. wash their hands as soon as possible

　C. go to see a doctor as soon as possible　　　　　　　 D. go home and have a good rest

74. According to the article, the writer would like the kids _______.

　A. to be polite to adults　　　　　　　　　　　　　 B. to be in better health

C. to have good manners　　　　　　　　　　　 D. to do well in exams

75. What does the underlined word “germs” mean in Chinese?

A. 咳嗽　　　　　　　　　　　　　 B. 喷嚏　　　　　　　　　　　 C. 鼻涕　　　　　　　　　　　 D. 病菌

C

School is not the safe place as it used to be. How to be safer in school? How can students stay away from danger? There are many activities that students can do to learn safety in an easy way. Here are some stories from the students who have had safety classes in Xuri Middle School.

Wang Lin：About Sports Safety

Once we made up a story about sports safety. All we needed to do was to point out safe and unsafe sports behaviors in the story. From this lesson, we knew we should always do warm?up(热身)activities before playing sports and drink some water after that.

Liu Ying：About Classroom Safety

Putting on short plays is a good way to learn and enjoy ourselves. We once put on a short play about a boy called Little Naughty. He always did something naughty(淘气的) in the classroom and got himself into trouble. In this way, we learned to behave well and get on well with each other.

Zhou Weilun：About Fire Safety

In our school，we have a fire emergency response practice(火警应急演习) in September every year. So we know where to go if there is a fire in school. We learn to use the fire extinguisher(灭火器)，too. But I don't think we should be allowed to put out the fire alone，it's too dangerous for young students like us.

根据短文内容，选择最佳答案。

56. The writer talks about ________ kinds of school safety in this passage.

A. two B. three C. four

57. According to the passage，we can learn that ________.

A. the students in school often get into trouble

B. school is not as safe as it used to be

C. there is a safety class in school once a month

58. Zhou Weilun tells us that they also learn how to use ________.

59. The passage is probably written for ________.

A. the athletes B. the firefighters C. the students

60. What is the best title for the passage?

A. Importance of School Safety 　　　B. Safety Activities for Students

C. How to Behave Well in School