题目列表(包括答案和解析)
| A.one of the great mysteries of nature. |
| B.electricity high above the earth. |
| C.a kind of light. |
| D.the sound from the clouds. |
| A.every person can see lightning every day. |
| B.at least one person is killed by lightning every day. |
| C.there are about 6 million flashes of lightning per year. |
| D.about one person per day dies from lightning. |
| A.stand under a tree. |
| B.go outside. |
| C.stay in a closed car. |
| D.stop near windows. |
| A.prevent accidents caused by lightning |
| B.stop lightning |
| C.protect buildings from being washed away. |
| D.delay the coming of lightning |
| A.30 kilometres per second. |
| B.3000 kilometres per second |
| C.3 kilometres per second |
| D.30,000 kilometres per second |
In old times,man considered lightning to be one of the great mysteries(神秘事物)of nature.In fact a single flash of lightning 1.6 kilometers long has enough electricity to light one million lamps.
The American scientist,Benjamin Franklin,was the first to suggest that lightning is in fact electricity formed between the earth and clouds high above.It happened in 1752.In the same year,he also built the first lightning rod(避雷针)to protect buildings from being struck by lightnings.
Modern science has discovered that lightning is very strong and powerful.A lightning between a cloud and the earth may be as long as 13 kilometers,and travels at a speed of 30 million meters per second.Scientists have the opinion that there are about 2000 million flashes of lightning per year.In the United States alone,it kills almost one person per day.
The safest place to be in during an electrical(电的)storm is a closed car.Outside,one should go close to low ground for cover and not stop under a tree.Also one should stay out of water and away from metal fences.Inside a house people should keep away from open doorways and windows and not touch wires or metal things.
【小题1】From this passage we know lightning is____.
| A.one of the great mysteries of nature. |
| B.electricity high above the earth. |
| C.a kind of light. |
| D.the sound from the clouds. |
| A.every person can see lightning every day. |
| B.at least one person is killed by lightning every day. |
| C.there are about 6 million flashes of lightning per year. |
| D.about one person per day dies from lightning. |
| A.stand under a tree. |
| B.go outside. |
| C.stay in a closed car. |
| D.stop near windows. |
| A.prevent accidents caused by lightning |
| B.stop lightning |
| C.protect buildings from being washed away. |
| D.delay the coming of lightning |
| A.30 kilometres per second. |
| B.3000 kilometres per second |
| C.3 kilometres per second |
| D.30,000 kilometres per second |
How to protect your teeth
【小题1】 . The first of twenty being to grow when you are over six months old. The second set of thirty-two grows from the age of six until you are about twenty-one years old.
【小题2】 , you must drink plenty of milk and eat greens.
【小题3】 . Then little food will be left on or between them to cause decay(导致蛀牙). Make sure that you turn the brush and go up and down as well as brushing side ways. Use dental floss(牙线)to make sure all food is removed from in between each tooth, if you cannot brush your teeth after eating, raise them with water, or eat an apple or a carrot.
【小题4】 . If there is a hole in a tooth, he or she will fill it. If you do not have it filled, then the hole will grow larger. When a hole grows too big, 【小题5】 . It is better to keep all your second set of teeth for as long as possible. Filling a gap where a tooth has come out with a kind of bridge and using a false tooth costs a lot of money.
| A. To help your teeth grow strong. B. You should brush your teeth after each meal. C. Carrots and apples are good for your teeth. D. The tooth may have to be taken out. E. Everyone should have a set of good teeth. F. Try to visit a dentist every six months. G. Every person has two set of teeth. |
We all need to exercise. Doctors say it is good for us. It makes your heart and body strong. It also gives you more energy. And you will feel better yourself. It’s best to exercise twice a week. Twenty minutes each time is enough.
There are many ways to exercise. You can walk, run, play sports, or swim. Many people go to special places to exercise. They are called “fitness centers”. These places have a lot of equitment. Some people buy equitment for their homes. But it is very expensive.
Exercising can be fun. Friends can exercise together at fithess center. Or they can play sports together, how do you exercise?
1.What is the main idea?
A. Exercise equitment is expensive. B. Playing sports is a good way to exercise.
C. Every person should exercise. D. Fitness centers are popular.
2.We should exercise ________.
A. every day B. 20 minutes a week.
C. twice a week D. two times a month
3. At fitness cemters,________.
A. you can buy expensive equitment B. people can do many kinds of exercise
C. it is very expensive D. exercising is not fun
4.Which of these kinds of exercise is not mentioned(提及)in the article?
A. Sports . B. Swimming. C. Running. D. Dancing.
5.Which of these sentences about exercising is true?
A. Exercising is expensive. B. Exercising good for heart.
C. Only doctors exercise. D. Friends never exercise together.
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