9．Lightning（閃電）is shocking，and it happens all over the world!Scientists think that there are more than three million lightning strikes（襲擊）every day in the world-that's thirty strik es 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（大氣層的）changes．When this happens，it creates a static charge（靜電電荷）．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 somethingto 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．
 
51．Lightning strikesC．
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
52．What does"surviving"in paragraph 2 mean in Chinese？B
A．目睹                     
B．幸存                     
C．制造                     
D．遇難
53．We can infer（推斷）from paragraph 3 thatD．
A．lightning strikes are caused whenever ice and water meet
B．lightning between two clouds is the most dangerous for humans
C．lig htning strikes create static charge
D．a(chǎn)bout one tenth of the people struck by lightning die every year in America
54．Which expression means"to toy with"in the last paragraph？A
A．to play with         
B．to take seriously                 
C．to show off   
D．to take it easy
55．Where's the best place to be when lightning strikes？D
A．On top of a hill．
B．In a swimming pool．
C．In a tree．
D．Inside．

分析 這篇文章講述閃電的殺傷力和世界上的一些電擊事例，在美國每年有十分之一的人被閃電擊中．以及閃電來襲時(shí)的躲避技巧．當(dāng)閃電來襲，最佳的停留地點(diǎn)是在一棟建筑物里．

解答 51．C考查細(xì)節(jié)理解．從第二段第二句Every year，lightning kills people because it can start big fires or because it reaches temperatures up to 28，000 degrees centigrade．閃電襲擊有時(shí)會(huì)達(dá)到很高的溫度．故選C．
52．B考查猜測詞義．從劃線詞的后一句Between 1942 and 1983，he was hit seven times!在1942-1983年間，他被雷電擊中了7次．可知是幸存者，故選B．
53．D考查細(xì)節(jié)理解．從第三段最后一句About 1，000 people get struck by lightning every year in the United States，and about 100 of them die as a result．在美國每年有十分之一的人被閃電擊中．故選D．
54．A考查細(xì)節(jié)理解．toy，名詞，意為：玩具．動(dòng)詞，意為：玩弄，隨隨便便的對待．A．to play with玩弄，B．to take seriously認(rèn)真對待，C．to show off炫耀，D．to take it easy放松．根據(jù)句意此處對應(yīng)答案A．
55．D考查細(xì)節(jié)理解．從最后一段it's best to stay inside a large building當(dāng)閃電來襲，最佳的停留地點(diǎn)是在一棟建筑物里．故選D．

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