关于职称英语理工类完形填空必备练习题

　　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 compass stopped working，a flame came down from the sky，and a wave 100 to 200feet 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 communications 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 compass points towards true north__13__magnetic north.__14__planes and ships can lose their way if they dont make adjustments.

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