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参考答案：
11-18 CBDD DACB
19-22 BCAD
23-25 DBC
26-29 DCCB 30-32 DAB 33-35 DBD
36．activity
37. average
38. temperature
39. muscles
40. breathing
41. regular
42. predominating
43.conciousness.
44. Your brain waves will show the large slow waves that are known as the delta rhythm.
45. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring In front of you.
46. Provided that you do not wake up during the first sleep period, your body will soon relax again, your breathing will grow slow and regular once more.
