单项选择题

In which point some sharks are similar with humans7

A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recover ability against diseas
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单项选择题
Why sharks are useful for humans
A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
单项选择题
How can sharks find their quarries
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of bloo
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