单项选择题

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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单项选择题
Which of the following most probably led to a decreased use of windmills in the U. S.
A．The advent of nuclear energy.
B．Increased environmental awareness.
C．The availability of inexpensive electricity in rural areas.
D．A long-term shift in wind currents.
单项选择题
Children in hospital usually turn to ______ in order to catch up with their school work.
A．hospital teachers
B．schoolmates
C．parents
D．school-teachers
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