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 strata are formed in rock.
C. Why flooding makes geological investigations difficult.
D. Which minerals can be found in rock.
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单项选择题
A. They make a lot of promises without carrying them out. B. They speak their minds. C. They breathe more fresh air. D. They assume polite manners.
A. They make a lot of promises without carrying them out.
B. They speak their minds.
C. They breathe more fresh air.
D. They assume polite manners.
单项选择题
A. Programs of science. B. Programs of medicine.C. Programs of art. D. Programs of history.
A. Programs of science.
B. Programs of medicine.
C. Programs of art.
D. Programs of history.
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