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.
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【简答题】Wealthy people,however,could afford to travel to sunny countries.
【单选题】Some customs travel well. Often, however, behavior. that is considered the epitome of ______ at home is perceived as impossibily rude or, at the least, harmlessly bizarre abroad.
【单选题】听力原文:It used to take a fortnight to travel from London to Edinburg by coach. However, you could never travel many times around the world in that time. What does the statement mean?
A.
Travel is much faster and convenient now than before.
B.
People are now travelling much more than in old days.
C.
Traveling to far-away places has become very common.
D.
It used to take two more weeks to travel by coach than now.