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．Weights and measurements.B．Political systems.C．Employment.D．Money.
A．Weights and measurements.
B．Political systems.
C．Employment.
D．Money.
单项选择题
A．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
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