单项选择题

Questions 30 to 32 are based on the passage you have just heard.

A. Falling rain. B. Grass and plants.
C. Dry air. D. Moist air.
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单项选择题
What do we learn from the research mentioned at the beginning of the passage
A. The participants were investigated for 6 years between age 51 to age 61.
B. The participants answered questions at the end of the study.
C. People who kept working were in better shape than the others.
D. AII kinds of jobs would be good for people as long as they kept working.
填空题
C)
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