单项选择题

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
A．He relaxes.B．He goes fishing.C．He goes to work.D．He works at home.
A．He relaxes.
B．He goes fishing.
C．He goes to work.
D．He works at home.
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S4
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