阅读理解，阅读下列短文，从各题所给的A、B、C和D项中选出最佳选项。

　　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．

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　　When I was growing up, I had an old neighbor, Dr．Gibbs．He didn’t look like any 　　1　　 I 　　2　　．He never invited us to play in his yard, but he was a very 　　3　　 person．

　　When Dr．Gibbs wasn’t saving lives, he was planting trees．He owned a large field and wanted to make it a forest．

　　The good doctor had some interesting ideas about planting trees．He never watered his new trees．Once I asked why．He said that watering plants spoiled them, and that if you 　　4　　 them, each baby tree would grow weaker and weaker, so you had to make things difficult for them and 　　5　　 the weaker trees early．

　　He talked about how watered trees grew shallow(浅的)roots, and how trees that weren’t watered had to grow deep roots in search of water 　　6　　 the earth by themselves．　　7　　 roots were very important．

　　So he never watered his trees．He'd planted an oak and, 　　8　　 watering it every morning, he'd beat it with a rolled-up newspaper．I asked him why he did that, and he said it was to get the tree's attention．

　　Dr．Gibbs died several years 　　9　　 I left home．Every now and then, I walked by his house and looked at the trees 　　10　　 I watched him 　　11　　 about twenty-five years ago．They’re very big and strong now．I planted some trees a few years later and carried water to them for a whole summer．After two years of 　　12　　 too much, whenever a cold wind blows in, they 　　13　　 a lot．

　　Every night before I go to bed, I check on my two sons．Mostly I pray(祈祷)that their lives will be easy．But lately I've been thinking that it's time to change my prayer．I know my children are going to face difficulties．There's always a cold wind 　　14　　 somewhere, so 　　15　　 we need to do is to pray for roots that reach deep into the brave heart, so when the rains fall and the winds blow, we can face it strongly and won't be beaten down．

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