单项选择题

A．To acquire information from satellites more efficiently.
B．To realize full coverage of area the satellite passes over
C．To build more ground observation centers.
D．To compare satellite information with those from ground.
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单项选择题
A．By fuming them farming.B．By affecting the quality of soil.C．By adding chemicals and polluting the waterways.D．By affecting the environments they live in.
A．By fuming them farming.
B．By affecting the quality of soil.
C．By adding chemicals and polluting the waterways.
D．By affecting the environments they live in.
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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