In a test of the invisible new shark­repellent system，a cable was placed around a beach in St.Lucia，an island in the tropics.A protective net，which had been installed around the beach a long time ago to keep sharks from swimmers，was left in place during the experiment.

　　When the electric field was left on for more than a year and a half，no sharks were found in the net.However，when the power was turned off,89 sharks ended up in the net.

　　Using the electric­wall method instead of nets to protect bathers would avoid the needless death of many sharks，said biologists.Currently，thousands of sharks die each year when they become trapped in protective nets that surround holiday resorts in Africa and Australia.About 10 to 15 humans are killed by sharks annually.

　　语篇解读：本文介绍了一种替代传统的沿海滨防鲨鱼网的新型电缆设施。这样既可以使在鲨鱼经常出现的海滨的游泳者安全也减少了鲨鱼因触网而造成的死亡。

　　1.In the first passage，why doesn't the shark attack the swimmers？

　　A.Because there are many swimmers in the water.

　　B.Because the shark doesn't want to eat the swimmers.

　　C.Because of some mysterious reason from the God.

　　D.Because there is an invisible electric field confusing the shark.

　　解析：细节推断题。根据“...an electrical system that repels sharks by controlling their movements.Confused by this action，the sharks end up turning back from the beach.”可知。

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