单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

A. How rocks are eroded.
B. How sediment hardens into rock.
C. How flood plains develop.
D. How minerals are extracted fromrock.
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单项选择题
A. There aren’t enough cabinets.B. There is too much noise.C. Office supplies are taking up space.D. Some teaching assistants don’t have desks.
A. There aren’t enough cabinets.
B. There is too much noise.
C. Office supplies are taking up space.
D. Some teaching assistants don’t have desks.
单项选择题
C
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