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
Why does the shark never stop moving
A．It never sleeps.
B．It can only smell when moving.
C．If stopped it would sink.
D．It must eat constantly.
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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