单项选择题

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
About 50 percent of the nation’s electricity was generated by

A．gas-fired power plants.
B．coal-fired power plants.
C．water-generated power plants.
D．wind-generated power plants.
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