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The result(½á¹û) was surprising. Where did the 164 pounds come from?ª¤

After many investigations(µ÷²é), the scientist got the answer. He had given water to the willow, and the willow got its food from the water.

He was right, in a way. Today we know more about the question.

1. The scientist did the experiment in the sixteenth century.

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2. Most people thought the plant got the food from the soil for its growth.

3. The soil in the vase weighed two hundred pounds.

4. The scientist found that the willow grew and weighed more and the soil weighed less.ª¤

5. The soil weighed 164 pounds after five years.ª¤

6. Now we know about the question as much as the scientist did.

(4)

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One afternoon Bob and Jane were walking along a quiet street when they heard a big noise from the street corner. They ran there and found that a small car had knocked into the side of a truck. Both the car driver and the truck driver were hurt.ª¤

¡°Bob,¡± said Jane, ¡°run back down the road to Mrs Day¡¯s house. Ask her to call the police and the ambulance(¾È»¤³µ). Hurry up. I¡¯ll stay here.¡±ª¤

Bob went off as fast as he could. There was nothing Jane could do but wait. She knew that when people were hurt in an accident£¬they shouldn¡¯t be moved.ª¤

It wasn¡¯t long before the police car and the ambulance arrived. The policemen got the car door open and moved the man out. Then they got the truck driver out. Luckily£¬the men weren¡¯t badly hurt£¬but they were both taken to hospital. The policemen thanked Bob and Jane. ¡°You were very good to act so quickly when you saw the accident. Thank you for all your help.¡±ª¤

1. The accident happened in a quiet street one afternoon.

2. Bob£¬Jane£¬Mrs Day and the policemen heard the noise.

3. Both of the drivers were hurt in the accident.ª¤

4. Jane asked Bob to call the police.ª¤

5. Jane had got the drivers out before the policemen arrived.

(5)

In America, just as in Europe, men usually open doors for women, and women always walk ahead of men into a room or a restaurant, unless £¨³ý·Ç£©the men have to be ahead of the ladies to choose the table, to open the door of a car or do some other things like the above On the street, men almost always walk or cross the street on the closer side of the ladies to the traffic But if a man walks with two ladies, he should walk between them Then if the host £¨ÄÐÖ÷ÈË£©or hostess £¨Å®Ö÷ÈË£©or both of them come in a car to get their guest for dinner, the guest should sit at the front seat and leave the back seat though there is no people sitting on it

1£®In America men usually _______

A£®walk ahead of women B£®eat in a restaurant

C£®walk behind women D£®drive a car to work

2£®In the street men ________

A£®cross the street

B£®walk on the right side of the ladies

C£®walk on the closer side of the ladies to the traffic

D£®walk near the ladies

3£®If a man walks with two ladies, he should _________

A£®walk between them B£®run before them C£®follow them D£®go away

4£®If Mrs. Green wants you to her house in a car, you should _________

A£®sit beside a guest B£®sit at the front seat

C£®sit at the back seat D£®drive the car

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(6)

Last Sunday I saw the worst storm£¨±©·çÓ꣩in years It came suddenly and went on for more than three hours After lunch, I went into my room to have a rest. The air was hot, and all was quiet

Then strong wind started blowing into my room Pieces of paper on my desk flew high into the air and some flew out of the open window As I ran out to catch them, big drops of rain began to fall.

When I came back into the house, it was raining harder and harder I tried very hard to close the window Then I heard a loud crashing£¨ÅöײµÄ£©sound from the back of the house. I ran out of my room to rind out what it was, a big tree had fallen down and broken the top of the back room.

1£®Before the storm, the weather was __________

A£®cold B£®cool C£®warm D£®hot

2£®The wind blew some of the paper ___________

A£®all over the floor B£®out of the door

C£®into the back room D£®out of the open window

3£®The top of the back room was broken because of __________

A£®the strong B£®the falling tree C£®the rain D£®the crashing sound

(7)

Light travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke from his gun before the sound reaches your ears.

This great speed of light produces some strange facts Sunlight takes about 8 minutes to reach us If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reached you The nearest star is so far away that the light that you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km. per minute. In some cases, the light from one of tonight's stars had started on its journey to you before you were born.

Thus, if we want to be honest, we can't say, "The stars are shining tonight" We have to say instead, "The stars look pretty They were shining four years ago, but their light has only just reached the earth."

1£®Light speed is ________ sound speed

A£®as fast as

B£®a million times slower than

C£®about millions of times faster than

D£®about a million times faster than

2£®If you stand 200 metres away from a man who is firing a gun to start a race, you will find out that _______

A£®you can hear the sound before you see the smoke

B£®the sound does not travel as ¡­¡­ ´Ë´¦Òþ²Ø£º5329×Ö£¬È«²¿ÎĵµÄÚÈÝÇëÏÂÔغó²é¿´¡£Ï²»¶¾ÍÏÂÔØ°É ¡­¡­