Humans need__1__(little) sleep than other mammals, yet__2__(they) slumber(睡眠) is more efficient, said__3__(research) at Duke University in North Carolina.

　　In their study, the scientists researched sleep patterns of hundreds of animals.They discovered humans sleep for shorter periods of time__4__(compare) to other animals.

　　The study also concluded that a human’s sleep has higher quality. A deeper stage of sleep, __5__(call) rapid eye movement sleep, or REM, makes up 25 percent of a human’s sleep. In primates(灵长目动物) like lemurs (狐猴 or monkeys, REM sleep does not reach the five percent mark.

　　“Humans are unique in__6__(have) shorter, higher quality sleep，” said David Samson, a study co－author.

　　Samsons research team found__7__humans can prosper with__8__average of seven hours of sleep a day. Other primates need as many as 14 to 17 hours of sleep.

　　Samson said human sleep habits__9__(evolve)

　　during prehistoric times.Human ancestors moved from sleeping in trees to sleeping on the ground. Better sleep in a shorter amount of time resulted__10__better sleeping habits.

　　答案　1.less　2.their　3.researchers　4.compared

　　5．called　6.having　7.that　8.an　9.evolved　10.from

　　Passage 8　(2017·山西大同摸底)

　　阅读下面材料，在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。

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