The Bermuda Triangle is one__1__the greatest mysteries of the sea.In this triangular area between Florida，Puerto Rico and Bermuda in Atlantic，ships and airplanes __2__to disappear more often than in__3__parts of the ocean。And they do so__4__ leaving any sign of all accident or any dead bodies.

　　It is__5__that Christopher Columbus was the first person to record strange

　　happenings in the area.His #pass stopped working，a flame came down from the sky，and a wave 1 00 to 200.feet.high carried his ship about a mile away.

　　The most famous disappearance in the Bermuda Triangle was the US Naval Air Flight 19.__6__December 5，1945，five bomber planes carrying 14 men.__7__ on a training mission’from the Florida coast.Later that day, all #munications with Flight 1 9 were lost.They just disappeared without a trace.

　　The next morning，242 planes and 19 ships took part in the largest air-sea search in history. But they found nothing.

　　Some people blame the disappearances__8__supernatural forces.It is suggested the__9__ships and planes were either transported to other times and places，kidnapped by aliens__10__ attacked by sea creatures.

　　There are__11__natural explanations，though.The US Navy says that the Bermuda triangle is one of two places on earth __12__a magnetic #pass points towards true north__13__magnetic north.__14__planes and ships can lose their way if they don’t 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.

　　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

　　10.A) and B) or C) nor D) neither

　　11.A)also B) no C) more D) beside

　　12.A) which B) there C) where D) that

　　13.A)instead of 　　B) except　　C) than　　D) nor

　　14.A)Similarly 　 B) furthermore　　C) However 　D) Therefore

　　15.A) as B) for C)by D) from