D. have rarely been used since electricity was discovered
54. What was a new use for wind power in the late 19th century ?
A. Sailing a boat. B. Producing electricity.
C. Grinding wheat into flour. D. Pumping water from underground.
55. One of the reasons why wind was rediscovered in the 1970s is that ______ .
A. wind power is cleaner
B. it is one of the oldest power sources
C. it was cheaper to create energy from wind
D. the supply of coal and gas failed to meet ends
56. What would the writer probably discuss in the paragraph that follows ?
A. The advantages of wind power.
B. The design of wind power plants.
C. The worldwide movement to save energy.
D. The global trend (趋势) towards producing power from wind.
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