There are a number of environmental features that can be found only in Bermuda Triangle． Because of these 1 characteristics, the triangle is one of the most dangerous areas in the Atlantic Ocean．

　The weather in the triangle is 2;its sudden changes often endanger the lives of sailors．

　The triangle is well known for unexpected storms, hurricanes that are out of season, and other unnatural 3 ． Many people feel that this 4 weather can explain most of the strange events which have occurred there．

　Because of the many violent storms, the triangle is often 5．

　Many ships leave land and disappear completely;the U．S．S． Cyclops, for example, 6 in 1918．

　Some missing ships carried 7 such as coal , oil , mahogany , and military supplies, while other ships carried only passengers ．

　 8might explain the disappearance of old ships , but investigators must look for other explanations when a new ship disappears．

　When a ship is reported missing, searchers rush to the area to look for 9which might explain the disappearance．

　One author tries to explain the disappearances of the ships by 10natural events or human error ．

　Another author believes that intelligences from another world are 11 the disappearances． He says that these extraterrestrial beings have a zoo where they 12all the missing seamen．

　Many people agree that natural 13 cannot explain the strange events in the triangle ． “It just isn’t natural for a ship to completely disappear like this ． It’s 14 , no matter how you try to explain it,”declared the seamen．

　“These eerie events make me afraid to sail out of 15 of land．”

1．A．only B．single C．mere D． only one

2．A．unexpectedly changeable B．extremely dangerous

　C．either A and B D． both A and B

3．A．Activities B．Accidents C．behaviors D． events

4．A．normal　　B．natural C．unnatural D． uncommon

5．A．improbable B．impassable C．impossible D． improper

6．A．lost B．missed C．separated D． spared

7．A．goods B．matters C．objects D． things

8．A．Engineers B．Engine drivers C．Engine operators D． Engine failures

9．A．evidence B．causes C．reasons D． findings

10．A．considering them as the cause of B．thinking them to be the cause of

C．regarding them as caused by　　 D． proving them to be the cause of

11．A．in charge of B．reasons for C．causes for D． responsible for

12．A．feed B．support C．keep D． raise

13．A．evidence B．causes C．reasons D． findings

14．A．uncommon B．Abnormal C．strange D． extraordinary

15．A．scene B．sight C．visibility D． view