卫生B答案
16.paul.... cultures. not mentioned
17. wkman...results right
18.Americans....guines not mentioned
19.ekman........everywhere right
20.Two.....thing right
21.fear......change nor mentioned
22 people....other right
23.paregraph1. E description...
24.paragreph2. C necessity...
25.paragraph3. D research...
26.paragraph4. F factors..
27.Techniques.... F improve..
28there.... B show..
29.the .... D affect..
30.the .... E be specially...