单项选择题

Why do sharks normally swim between ten and twenty miles off the coast of Britain

A．They prefer warm water to cold water.
B．They see best in deep water.
C．They are afraid of man.
D．That is where their food is.
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单项选择题
If you kick and make a lot of noise in the water, ______.
A．the shark will kill you
B．the shark will attack your feet
C．you will frighten the shark away
D．you will attract the shark
单项选择题
It is less common to find sharks in ______.
A．salt water
B．fresh water
C．warm water
D．deep water
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