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试题(卫生B)
.... cultures. not mentioned
17. wkman...results right
18.Americans....guines not mentioned
........everywhere right
20.Two.....thing right
......change nor mentioned
22 people....other right
aph1. E description...
eph2. C necessity...
aph3. D research...
aph4. F factors..
27.Techniques.... F improve..
28there.... B show..
.... D affect..
.... E be specially...