A. use it directly B. carry goods out
C. cross the fast flowing streams D. find enough workers
27. The steam engine soon replaced flowing water because_______.
A. coal and oil are derived from the sun
B. coal and oil are not always accessible
C. coal and oil are portable
D. coal and oil are found in thinly-populated areas
28. After using coal and oil for a time, people find the advantages of water over coal and oil as_______.
A. it is easy to recover the initial capital
B. it is as cheap to use water as to use coal and oil
C. it is nature that renews the water without any cost
D. it is difficult to extract and transport coal and oil
29. All of the following are required for an ideal river EXCEPT that_______.
A. there should be energy of gravity
B. there should be a steep fall
C. the river should be near industrial centers
D. there should be an adequate flow of water
30. It can be inferred from the passage that if people want to establish a water power station, they will most probably go to_______.
A. the mountainous areas B. the plains
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