Sleep is something we generally associate with living creatures. Of course, it is (36) that a lot of animals sleep, but zoologists are certain that (37) forms of animal life, (38) worms and snails, never really sleep. On the other (39) , animals such as bears sleep for 4 (40) 5 months every year.
The (41) of sleep a human being needs (42) on age, the individual and possible (43) . For example, doctors think that pre school children need between 10 and 12 hours a night, school children between 9 and 11 hours, and (44) between 7 and 8 hours. There are exceptional (45) of old people (46) only sleep between 2 and 3 hours a day and (47) to be active and healthy. The sleep (48) of different (49) also appear to be (50) . Japanese people for example, sleep (51) hours than Europeans.
(52) is not known for (53) whether mental activity (54) whe
A. genuine
B. true
C. indeed
D. sincere
Sleep is something we generally associate with living creatures. Of course, it is (36) that a lot of animals sleep, but zoologists are certain that (37) forms of animal life, (38) worms and snails, never really sleep. On the other (39) , animals such as bears sleep for 4 (40) 5 months every year.
The (41) of sleep a human being needs (42) on age, the individual and possible (43) . For example, doctors think that pre school children need between 10 and 12 hours a night, school children between 9 and 11 hours, and (44) between 7 and 8 hours. There are exceptional (45) of old people (46) only sleep between 2 and 3 hours a day and (47) to be active and healthy. The sleep (48) of different (49) also appear to be (50) . Japanese people for example, sleep (51) hours than Europeans.
(52) is not known for (53) whether mental activity (54) whe
A. original
B. primitive
C. preceding
D. former
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