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.

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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

单项选择题Why sharks are useful for humans.*

A. Their tasty meat.
B. The principle of their defense system against disease.
G. Their solid skin.
D. The principle of their birth modes.