题目内容

Lightning(闪电)is shocking, and it happens all over the world! Scientists think that there are more than three million lightning strikes(袭击)every day in the world-that’s thirty strikes every second.

Lightning can also be very dangerous. Every year, lightning kills people because it can start big fires or because it reaches temperatures up to 28,000 degrees centigrade. American Roy Sullivan, who worked in a park, holds the record for surviving the most lightning strikes. Between 1942 and 1983, he was hit seven times!

So, why does lightning strike? Lightning strikes happen when ice and water in clouds rub(摩擦)together, and cause atmospheric(大气层的)changes. When this happens, it creates a static charge(静电电荷). Lightning can strike inside the cloud, between two clouds and between a cloud and Earth. It’s the last type of strike that is the most dangerous for humans. About 1,000 people get struck by lightning every year in the United States, and about 100 of them die as a result.

Lightning is certainly not something to toy with. When lightning strikes, it’s best to stay inside a large building. To stay safe, do not stand under trees, on hills or near water. Trees attract lightning. Also, do not lie down on the ground, otherwise the electricity may go through you and cause a heart disease.

1 Lightning strikes ________.

A. happen three billion times each day

B. will start when there are big fires

C. can reach very high temperatures

D. kill all those who work in a park

2  What does “surviving” in paragraph 2 mean in Chinese?

A.目睹                       B.幸存                 C.制造                       D. 遇难

3 We can infer(推断)from paragraph 3 that ________.

A. lightning strikes are caused whenever ice and water meet

B. lightning between two clouds is the most dangerous for humans

C. lightning strikes create static charge

D. about one tenth of the people struck by lightning die every year in America

4 Which expression means “to toy with” in the last paragraph?

A. to play with         B. to take seriously    C. to show off  D. to take it easy

5 Where’s the best place to be when lightning strikes?

A. On top of a hill.   B. In a swimming pool.  C. In a tree.  D. Inside.

1 C        2 B         3D          5 A        5D

练习册系列答案
相关题目

There are nearly 400 different types of sharks, but only about 30 types have even been reported as attacking human beings.
The chances of being attacked by a shark are very small compared to other dangers. Many more people drown（溺死）in the ocean every year than are bitten by sharks. The low number of attacks that happen every year proves that sharks do not feed on humans if they have the choice. There are three types of shark attacks. The main one is known as a ‘hit and run’. The shark attacks because it thinks you are a fish, but when it tastes a human it decides not to eat you. The second type is called a ‘bump and bite’. The shark bumps you to find out if you are fit to be eaten and then bites you if it thinks you are. The third type is called a ‘sneak’. When attacking in this way, the shark waits for you to swim by and attacks you suddenly. The latter（后者的）two types of attack are more likely to be deadly for humans.
However, your chances of being attacked by a shark can be reduced if you follow the advice below.
Do not swim in the dark. Sharks can still see you but you cannot see them.
Do not swim if you are cut or if you have a fresh wound. Sharks can smell blood over a long distance.
Do not wear bright clothing or jewellery because sharks are attracted to colours and shiny objects.
Try and stay in groups, as sharks usually avoid large numbers of people.
Don’t be frightened（受惊吓）by sharks as there is 30 times greater chance of being hit by lightning than being attacked by a shark.
【小题1】Are there only 30 types of sharks in the world?
【小题2】Are the chances of being attacked by a shark small or big compared to other dangers?
【小题3】What are the two deadly shark attacks called?
【小题4】Why should you try and stay in groups to avoid the shark attack?
【小题5】What does the writer mainly tell us in the passage?
Why was the house on fire? _______ lightning hit it.
A．BecauseB．Since　C．AsD．Because of

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

根据句子意思及汉语提示，写出所缺单词。
【小题1】Take the      (第二) turning on your right and you’ll see the museum.
【小题2】Her      (声音) sounds sweet on the phone.
【小题3】I was      (写) a report when the doorbell rang.
【小题4】There is no plant life      (没有) lightning.
【小题5】When you get home, give a call to let me know you’ve      (到达) safely.

A little girl walked to and from school every day. Though it was not fine and clouds appeared in the sky that morning, the little girl made her daily trip to school as usual. When school was over, winds became stronger and it began to rain.

The mother of the little girl felt worried that her daughter would be afraid and that lightning might frighten(惊吓) her child. Following the bright light of lightning, the mother quickly got into her car and drove to her child’s school.

As the mother drove along the road, she saw her little girl walking alone in the rain. To her great surprise, she found that when a lightning came, her daughter stopped, looked up and smiled. Another lightning came and then another followed. With each lightning, the little girl stopped, looked up and smiled.

Inside the car, the mother asked her daughter, “What were you doing? Why did you look up and smile when the lightning came?” The little girl answered with a smile, “Mum, you know, God was looking at me. Each time I felt a little afraid walking in the rain, God would take a picture of me. I knew he was playing a game with me.”

1.The little girl went to school __________ every day.

A．by car            B．on foot           C．by bus            D．by bike

2.At first, the mother felt worried because          .

A．she couldn’t look after her daughter

B．her daughter hadn’t taken her umbrella

C．she had something more important to do

D．her daughter might be afraid of lightning

3.According to the article, we can know that the little girl was          .

A．proud            B．shy              C．brave            D．nervous

 

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网