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21.The nuclear family __________ a self-contained, self-satisfying unit composed of father, mother and children.
A. refers to B. defines C. describes D. devotes to
22. Some polls show that roughly two-thirds of the general public believe that elderly Americans are ________ by social isolation and loneliness.
A. reproached B. favored C. plagued D. reprehended
23. In addition to bettering group and individual performance, cooperation ________ the quality of interpersonal relationship.
A. ascends B. compels C. enhances D. prefers
24. In the past 50 years, there ________ a great increase in the amount of research _____ on the human brain.
A. was…did B. has been…to be done C. was…doing D. has been…done
25. “ I must have eaten something wrong. I feel like _____.”“We told you not to eat at a restaurant. You’d better _______ at home when you are not in the shape.”
A. to throw up…to eat B. throwing up…eating
C. to throw up…eat D. throwing up…eat
26. Parents have to show due concerns to their children’s creativity and emotional output; otherwise what they think beneficial to the kids might probably _______ their enthusiasm and aspirations.
A. hold back B. hold to C. hold down D. hold over
27. According to psychoanalysis, a person’s attention is attracted ________ by the intensity of different signals ________ by their context, significance, and information content.
A. not less than…as B. as…just as C. so much…as D. not so much…as
28. They moved to Portland in 1998 and lived in a big house, _______ to the south.
A. the windows of which opened B. the windows of it opened C7U O:`na
C. its windows opened D. the windows of which opening
29. The lady who has _______ for a night in the dead of the winter later turned out to be a distant relation of his.
A. put him up B. put him out C. put him on D. put him in cd
30. Bystanders, _______, _________ as they walked past lines of ambulances.
A. bloody and covered with dust, looking dazed
B. bloodied and covered with dust, looked dazed
C. bloody and covered with dust, looked dazed
D. bloodied and covered with dust, looking dazed