问答题

The processing of sewage(污水) requires considerable amounts of electricity. Many sewage treatment plants in the U.S. have become self- sufficient by using the methane gas (沼气)given off by sewage.

【参考答案】

污水处理需要大量的电。美国的许多污水处理厂通过使用污水排放出的沼气实现电的自给自足。
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单项选择题
According to the passage, methane gas is used to ______.
A．conserve(保存) industrial residues(废料)
B．create recycled paper products
C．provide electricity to process sewage
D．treat with the raw sewage
单项选择题
A．appearanceB．frameworkC．outlookD．structure
A．appearance
B．framework
C．outlook
D．structure
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