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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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
The shark's best sense is smell because ______.
A．most of its brain is used for this purpose
B．it is colour blind
C．it can smell blood from a quarter of a mile away
D．it can only see up to fifty feet
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