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.
【小题2】In the U.S____.
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.
【小题3】During a lightning storm,it would be best if you____.
A.stand under a tree.
B.go outside.
C.stay in a closed car.
D.stop near windows.
【小题4】A lightning rod can______.
A.prevent accidents caused by lightning
B.stop lightning
C.protect buildings from being washed away.
D.delay the coming of lightning
【小题5】A lightning between a cloud and the earth may be 13 kilometers long,and travels at
a speed of ______.
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.
【小题2】In the U.S____.
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.
【小题3】During a lightning storm,it would be best if you____.
A.stand under a tree.
B.go outside.
C.stay in a closed car.
D.stop near windows.
【小题4】A lightning rod can______.
A.prevent accidents caused by lightning
B.stop lightning
C.protect buildings from being washed away.
D.delay the coming of lightning
【小题5】A lightning between a cloud and the earth may be 13 kilometers long,and travels at
a speed of ______.
A.30 kilometres per second.
B.3000 kilometres per second
C.3 kilometres per second
D.30,000 kilometres per second

Here are some American classroom customs:

     If the teacher asks a question, you are expected to give an answer. If you do not understand the question, you should put up your hand and ask the teacher to repeat the question. If you do not know the answer, it is all right to tell the teacher that you do not know. Then he or she knows what you need to learn.

     There is no excuse for not doing your homework. If you are absent (缺席), you should ear your teacher or someone who is in your class and ask for the assignment(作业). It is your responsibility (责任) to find out what assignments you have missed. It is not the teacher's responsibility to remind you of missed assignments.

      You must not be absent on a test day. If you are seriously ill, call and let the teacher, know you will not he there for the test. If your teacher allows make - up tests, you should take the test within one or two days after returning to class. Serious illness is the only reason for missing a test.

      Be on time! It is considered(认为) rude to be late. Also, it disturbs other students. If you must come in late, be sure to do it quietly. Have your books and papers out of your bag before you come into the room. Then go to your seat and sit quietly. In the U. S. it is not necessary to knock before you enter the classroom. If you must leave during class, do so quietly. There is no need to ask the teacher's per-mission. Entering a teacher's office or any office with a closed door without knocking fast is not accept-able. Knock first, then wait to he invited in.

      Wearing a hat in class is considered impolite by many teachers. Some teachers may ignore it, but you should ask permission first.

1. What should a student do if he or she doesn't understand the teacher' s question?

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2. If a student misses a class, how can he or she find out the assignment?

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3. What is the only reason for missing a test?

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4. Is it necessary for a student to knock before he or she enters the classroom ?

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5. What about wearing a hat in class?

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