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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
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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.
| A．lighter than | B．heavier than | C．no heavier than | D．as heavy as |
【小题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 |
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听力
第一节 听对话或独白(共15小题，每小题2分，满分30分)
听下面五段对话或独白，每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置．听每段对话或独白前，你将有时间阅读各小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间．每段对话或独白读两遍．
听第1段材料，回答第1－3题．
1．What does the woman want to do?
A．To get to the cinema．
B．To go to a shoe shop．
C．To go to a post office．
2．Where is the place the woman is going to?
A．Not far from the Queen’s Road．
B．Across the road．
C．Behind the post office．
3．How will the woman go to the place?
A．On foot．
B．By taxi．
C．By bus．
听第2段材料，回答第4－7题．
4．How many countries are mentioned in the dialogue?
A．four
B．six
C．five
5．Why did the man visit those countries in most cases?
A．For holiday．
B．For work．
C．On business
6．What country do you think the man has visited the most often?
A．China
B．Britain
C．Japan
7．How long did the man work in France?
A．One year
B．Two years
C．Three years
听第3段材料，回答第8－9题．
8．When is Alice's birthday?
A．The next day
B．The day after next
C．The day they had the talk．
9．What will the man and the woman buy for Alice?
A．A record
B．Some books
C．A box of chocolates．
听第4段材料，回答第10－12题．
10．What is the man?
A．A farmer
B．An engineer
C．A pilot
11．What did the object do?
A．It stayed still all the time
B．It moved round from time to time
C．It flew away quickly
12．How did the man describe the object?
A．It was bigger than a normal plane
B．It was smaller than normal plane
C．It was as big as a normal plane
听第5段材料，回答第13－15题．
13．What is the speaker mainly talking about?
A．The importance of money
B．The development of money
C．Different kinds of money
14．When was paper money invented?
A．No one knows
B．Around the 10th century in China
C．Around the 9th century
15．What does the speaker believe?
A．The Euro dollar will be used instead of the American dollar
B．The American dollar will be used for international trade
C．All the world will use the same money
第二节 听取信息(共5小题，每小题2分，满分10分)
下面你将听到一段录音，请根据题目要求，从听到的内容中获取必要的信息，填入空格中．录音内容播放两遍．第一遍播音后，你有一分钟的时间填写你所听到的内容，而后播放第二遍；播放第二遍后，你有半分钟的时间检查答案．
选词填空
There is something people didn' t understand in the sky．The USAF(美国空军) 1 used the words "Unidentified Flying Object" to describe them．Today 2 uses the term(术语,说法)UFO．When people see a UFO, it is 3 a weather balloon(气球)or an airplane．But the Center 4 UFO Studies continues to receive 5 of reports every year．
In 1947 a businessman(商人)and pilot, Kenneth Arnold, 6 near Mount(山)Rainier, Washington when he saw nine shiny, round objects(物体)flying through the air(天空)．He told a newspaper reporter that they 7 like "pie plates skipping(跳)over(在……上方)water"．The reporter used the words "flying saucer(飞碟)" in his story and today that 8 a popular name for UFOs．
Now in different countries, many people 9 the UFOs．Some people make mistakes when they say they have seen UFOs．But people still can't 10 UFOs clearly．It may take many years to find a clear answer．