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 blood.

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单项选择题

In which point some sharks are similar with humans

A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recovery ability against disease.

单项选择题

What is this passage mainly about

A．Call On people to protect sharks.
B．Point out the living environment of sharks.
C．Explain why the sharks are dangerous.
D．An introduction to sharks.