单项选择题

Which of the following is NOT an advantage of wind energy

A．Wind energy does not require the flooding of large land areas.
B．Wind energy produces no waste products.
C．The availability of wind energy is not dependent on the weather.
D．Wind energy does not produce thermal or chemical effluents.
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According to the passage, which of the following was wind energy first used for
A．Pumping water.
B．Electricity.
C．Propelling ships.
D．Grinding grain.
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Children in hospital usually turn to ______ in order to catch up with their school work.
A．hospital teachers
B．schoolmates
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