one as well. Even if awake, they're in no condition to learn much of anything.
In one study, more than 90 percent of teenagers
57
they slept less than the
58
nine hours a night, and 10 percent said they slept less than six hours.
59 _ James B. Maas, a Cornell University psychologist and Leading sleep researcher, has observed, most teenagers are "walking zombies(僵尸)"
they get far too little sleep.
41. A. children B. newborns C. elders D. youngsters
42.A. from B. with C. out D. up
43. A. reduction B. increase C. growth D. improvement
44. A. teenagers B. students C. babies D. preschoolers
45. A. related B. separated C. aged D. varied
46.A. demanding B. challenging C. satisfying D. encouraging
47. A. adults B. toddlers C. babies
D. schoolchildren
48. A. in B. on C. at D. for
49. A. excitedly B. early
C. casually D. naturally
50. A. form B. means C. method D. way
51. A. end B. start C. holiday D. examination
52. A. Since B. For
C. Yet D. Then
53. A. nicer B. earlier
C. cleaner D. better
54.A. that B. its C. what D. whose
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