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    Scientists in Switzerland have used lasers (激光)to change the path of a lightning strike.The experiment was carried out on S?ntis mountain in Switzerland,near a radio and TV tower that's hit by lightning about 100 times a year.Using a special laser,the researchers were able to guide the lightning strike.
   Scientists have been trying to find a way to protect buildings from lightning for a long time.Currently,the best way to protect buildings from lightning is by putting metal rods(棒)on the buildings.But lightning rods can only protect & small area.If a building is very large,it needs a lot of lightning rods.But some buildings-such as airports-are so large that it's difficult to protect the whole building using lightning rods.
   Another idea is to use lasers to guide lightning.The idea of using lasers to guide lightning isn't new.Scientists have been working on the idea for over 20 years.They have successfully guided lightning with lasers inside a laboratory.
   But until recently,scientists haven't been able to guide lightning with lasers outside.That changed in the summer of 2021.Using a powerful laser that can fire about 1,000 times a second,scientists in Switzerland were able to guide lightning for 164 feet away.
   The heat from the laser creates a path of air that is less thick than the air around it.The path also has a special charge.The lightning can follow this path almost as if it were a lightning rod.
   But despite the progress,the laser still didn't guide the lightning as far as the scientists would like.To protect buildings from most lightning,lasers will have to guide the lightning for a much longer distance.The laser is also very expensive.The scientists say it cost about 2 billion.It will probably take 10 or more years before a laser like this is truly able to protect large buildings.

(1)What is this new technology expected to protect?
B
B

A.High buildings.
B.Large buildings.
C.Important buildings.
D.Complex buildings.
(2)What do we know about the new technology of using lasers?
A
A

A.It is still being tested.
B.It works only in the lab.
C.It is an invention of Swiss scientists.
D.It cools the air around the lightning.
(3)What does the last paragraph mainly tell us about the new technology?
B
B

A.Its cost control.
B.Its disadvantages.
C.Its wide application.
D.Its promising future.
(4)What can be the best title of this text?
A
A

A.Guide Lightning With a Laser
B.Lightning Rods Are out of Date
C.Use Lasers to Block Lightning
D.Lightning Can Be Used to Serve People
【考點】說明文;科普知識
【答案】B;A;B;A
【解答】
【點評】
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發(fā)布:2024/5/16 8:0:9組卷:1引用:1難度:0.5
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