题目内容
35. ___
A new fuel for buses.
B. The causes of air pollution.
C. A way to improve fuel efficiency in buses.
D. Careers in environmental engineering.
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31. ___
A. The strength of ocean currents.
B. The movement of sediment deep in the ocean.
C. The best methods for studying deep ocean processes.
D. A new way of measuring the depth of the ocean.
32. ___
A. Why the book talks about turbidity currents.
B. How winds can affect some ocean currents.
C. The causes of underwater earthquakes.
D. What a turbidity current is.
34. ___
A. By greatly increasing the ocean's depth in some areas.
By creating large waves on the surface of the ocean.
C. By causing mud or sand to mix with ocean water
D. By crushing large amounts of stone.
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