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

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.

单项选择题

Why are sharks useful for humans

A．For their tasty meat.
B．For the principle of their defense system against disease.
C．For their solid skin.
D．For the principle of their birth modes.