单项选择题

A．Father and daughter.
B．Mother and son.
C．Teacher and pupil.
D．Doctor and patient.
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单项选择题
A．Water from inland seas.B．Rainwater.C．Sewerage.D．Water from mountain streams.
A．Water from inland seas.
B．Rainwater.
C．Sewerage.
D．Water from mountain streams.
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.
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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