原文摘自每日英语听力“VOA 常速英语”频道6.17内容。
Coal mines are quiet in the hills of Appalachia.
The power plants they fuel are shutting down one by one as electric utility companies switch to greener energy.
Though the Trump administration has worked to weaken environmental rules, many big corporations are taking their own steps to fight global warming.
1.耐力练习
加粗部分即句子主干。
2.力量练习
The power plants they fuel are shutting down one by one as electric utility companies switch to greener energy.
主干：电厂正在倒闭。
什么电厂？
they fuel（采用它们（煤矿）作燃料的电厂）
倒闭得多吗？
one by one（一家接一家地倒闭）
为什么会倒闭？
as electric utility companies switch to greener energy（因为电力公司转向了更加绿色（环保）的能源）
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