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Keep safe in storms
In the spring and summer months, thunderstorms(雷雨) are common. _____小题1:____. In thunderstorms, lighting can strike(击中) people and buildings and is very dangerous.
It was reported that a man was struck by lighting when he was making a phone call under a tree. He died at once. You may not know it, but nearly 1,800 thunderstorms are happening at any moment around the world.______ 小题2:____.
So what should you do during a lighting storm? Scientists say that a person’s chances of being struck by lighting are 1 in 600,000. ____小题3:____
If you are indoors during a thunderstorm:
Stay away from anything that is metal because lighting can come into the house through it.
Don’t stand near the windows.
Don’t take a shower or bath. Lighting can travel through water.
Never use the phone.____ 小题4:______.
If you are caught in a thunderstorm outdoors:
_____小题5:_____. If there’s no building around, try to find a low place to stay in.
Do not go under a tree because the lighting could hit the tree and travel through the tree to hit you.
Never use a cell phone.
A．But you can reduce those chances by following these safety rules.
B．But it is very important for us to learn about lighting.
C．Lighting could travel through the phone line and hit you
D．In fact, many people are killed by lighting every year.E. Try to get home as soon as possible.
F. Since they happen often, some people don’t take them seriously.
G. Go into a nearby building or car right away.
，因此条件(1)充分；针对条件(2)有3月份产值为a(1+10%)(1-10%)=0.99a，因此1月份的产值比3月份产值
。