16.The snow rangers are employees of ________.
A.the Forest Service
B.the Resource Bureau
C.the Tourist Board
D.the Sports Bureau
17.A snow ranger himself must be ________.
A.a college graduate
B.a physicist
C.a geologist
D.a mountaineer
18.A snow ranger uses very powerful guns________.
A.to warn skiers of an approaching avalanche
B.to signal for help in an emergency
C.to create an avalanche
D.to communicate with the ski area's operator
19.The primary duty of the snow ranger is ________.
A.to make sure ski area's operators are following safety rules
B.to predict and control avalanches in mountainous areas
C.to check skis and repair them
D.to forecast the weather
20.The passage implies that a snow ranger ________.
A.knows how to use a pistol
B.must write lengthy reports on his work
C.may travel many miles when he is on duty
D.has a long working day
Ⅲ.短文改错
下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。
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