题目内容
33. ___
A. It's cleaner.
B. it's heavier.
C. It's warmer.
D. It moves more slowly.
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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.
35. ___
A. To explain how winds cause turbidity currents.
B. To remind the student where ocean sediments originate.
C. To explain the effects of turbidity currents.
D. To remind the student about the next assignment.
36. ___
A. To convince him to go on a canoe trip.
B. To invite him to a cookout.
C. To ask if she can borrow his car.
D. To tell him about a trip she took.
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