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英语六级

单选题

A．It made the subways much quieter.
B．It brought electric light to the tunnels.
C．It allowed passengers to breathe cleaner air in the tunnels.
D．It allowed subways to be repaired inexpensively.

参考答案：C进入在线模考

According to the professor, what major advantage for the subway did electricity offer?
细节题。根据It solved one problem that the early English subways suffered from，unbearable smoke of steam engines that made breathing in the subway tunnels almost impossible．可知电车的出现使得地铁更换了动力，不再以蒸汽机为动力，解决了人们在地铁上难以呼吸的问题。因此，正确答案是C。

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