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

A little knowledge can make a difference at a time of life or death. Do you know what to do if you find yourself in an earthquake?
lf you are inside:
Quickly move under a strong desk, a strong table or along a wall. You can also go into a small room like the bathroom. This will protect you from falling things. Do not get into a lift.
Don't stand near windows, large mirrors, heavy furniture of fireplaces.
If you're outside:
Move away from buildings and streetlights. These could fall on you. Squat(蹲下) and protect your head until the shaking stops.
After the earthquake:
Check, take care of injuries and help make sure people around you are all right. Watch out for aftershocks.
Protect yourself by wearing long pants, a long-sleeved(长袖的)shirt and strong shoes. Listen to tile radio for the latest information.
【小题1】If you are in a tall building when an earthquake happens, you'd better        .

A．run into a lift	B．not stay in the bathroom
C．stand near large mirrors	D．not stand near windows

【小题2】lf you outside during an earthquake        

A．you must move into a building

B．you cannot squat

C．you have to stop the shaking

D．you must move away from streetlights

【小题3】After the earthcluake, you should        

A．look after injuries

B．not help the others around you

C．protect yourself without wearing shoes

D．not listen to the radio for the latest information

【小题4】The underlined word "aftershocks" in the passage means        in Chinese.

A．震感

B．震源

C．余震

D．防震