问题
单项选择题
An emergency sea anchor may be constructed by using（）.
A.a boat bucket
B.an air tank filled with water
C.an oar and canvas weighted down
D.All of the above
答案
参考答案：D
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An emergency sea anchor may be constructed by using（）.
A.a boat bucket
B.an air tank filled with water
C.an oar and canvas weighted down
D.All of the above
参考答案：D