There are__11__natural explanations，though.The US Navy says that the Bermuda triangle is one of two places on earth __12__a magnetic compass points towards true north__13__magnetic north.__14__planes and ships can lose their way if they dont make adjustments.

　　The area also has changing weather and is known__15__its high waves.Storms

　　Can turn up suddenly and destroy a plane or ship.Fast currents could then sweep away any trace of an accident.

　　Bermuda Triangle 百慕大三角区

　　Florida 佛罗里达，美国的一个州

　　Pueto Rico 波多利加]

　　Compass n.罗盘，指南针

　　Supernatural adj.超自然的

　　Kidnap v.绑架

　　Alien n.外星人

　　Magnetic adj.有磁性的

　　Trace n.痕迹

　　练习：

　　1.A)from B) Of C)about D) on

　　2.A)often B)look C)sometimes D) seem

　　3.A)rest B) another C) other D)others

　　4.A)without B)by C)from D)upon

　　5.A)saying B)being said c)said D)says

　　6.A) On B)In C) from D) since

　　7.A)took up B) took as C) took after D) took off

　　8.A)for B) about C) on D) from

　　9.A)missing B) missed C) miss D) having missed

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