单项选择题

A．By forcing them farming.
B．By affecting the quality of soils.
C．By adding chemicals and pollute the waterways.
D．By affecting the environments they live in.
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单项选择题
A．To a coach.B．To an optometrist.C．To a dentist.D．To a waitress.
A．To a coach.
B．To an optometrist.
C．To a dentist.
D．To a waitress.
单项选择题
A．Acquire information from satellites more efficiently.B．To realize full coverage of area the satellite passes over.C．Building more ground observation centers.D．Compare satellites information with those from ground.
A．Acquire information from satellites more efficiently.
B．To realize full coverage of area the satellite passes over.
C．Building more ground observation centers.
D．Compare satellites information with those from ground.
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