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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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.

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