新概念英语第四册：第19-21课习题及答案
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【篇一】Unit 19课后习题:
Multiple choice questions 多项选择题
Choose the correct answers to the following questions.
Comprehension 理解
1 Giving the body a rest ____.
a.seems to be the main function of sleep
b.doesn't seem to be the main function of sleep
c.means that sleep must have some function
d.prevents muscle inactivity
2 Electrical activity ____.
a.is a good indication of the way the body rests during sleep
b.doesn't seem to diminish during sleep
c.is a plausible explanation for the function of sleep
d.must always be recorded during sleep
3 Rapid eye movements are an indication that
a.a person is having a disturbed sleep
b.sleep is very deep
c.that a sleeper is dreaming
d.that a person is drifting into sleep
4 One of these statements is true.Which one?
a.The most important function of sleep is dreaming.
b.Rapid eye-movement is associated with deep sleep.
c.People who experience rapid eye-movements show personality disorders.
d.When people are woken, they don't report any dreams.
Structure 句型
5 ____ have speculations gone on? ____ Forthousands of years.(11.2-3)
a.How many
b.How often
c.How much
d.How long
6 The bodies tissues can repair ____ .
a.themselves
b.their self
c.itself
d.them
7 Peculiar bursts of eye-movements ____ an individual's sleep.(1.14)
a.punctuate
b.is punctuating
c.are punctuating
d.have punctuated
8 People woken during these periods of eye-movements generally reported that they had beendreaming ____.(11.15-16)
a.for a while
b.during sleep
c.before they went to sleep
d.just this moment
Vocabulary 词汇
9 Speculations have been going on for thousands of years ____.(11.2-3)
a.so to speak
b.in history
c.and recorded
d.in fact
10 This might be a plausible ____.(11.8-9)
a.conclusion
b.deduction
c.philosophy
d.theory
11 The second factor is more interesting and more ____.(1.13)
a.obvious
b.basic
c.apparent
d.acceptable
12 Some eye-movements were slow, others ____ and rapid.(1.15)
a.smooth, quick
b.interrupted
c.sudden, irregular
d.painful, repeated
课后习题答案:
Unit 19 BBCAD AABDD BC
【篇二】Unit 20 课后习题及答案
Multiple choice questions 多项选择题
Choose the correct answers to the following questions.
Comprehension 理解
1 One of these statements is true.Which one?
a.Snakes need poison to digest their food.
b.Snakes can feed on other animals without the use of poison.
c.Non-poisonous snakes find survival more difficult than poisonous ones.
d.All snakes are capable of manufacturing poison.
2 The possession of poison in the saliva makes hunting ____.
a.easy for all carnivores
b.a two-edged weapon when carnivores fight each other
c.almost effortless for snakes
d.unpredictable, as Nature intended
3 The poison that acts on the blood ____.
a.acts less rapidly than nerve poison
b.doesn't affect the victim as badly as nervepoison
c.is made by snakes like mambas and cobras
d.was probably the first of the two kinds of poisonto be developed
4 Human beings ____.
a.can't compare with prey such as rats and mice
b.respond to all snake poisons in the same way
c.are likely to survive nerve poison but not blood poison
d.are not the intended victims of snake poison
Structure 句型
5 They ____ have been able to catch and live on prey without using poison.(1.3)
a.might
b.should
c.would
d.must
6 They could have caught and lived on prey without ____ poison.(1.3)
a.to use
b.use
c.the use of
d.have used
7 For ____ snakes, poison is merely a luxury.(1.4)
a.these
b.a
c.-
d.an
8 Blood poison is the more unpleasant ____.(1.15)
a.of them all
b.of the two
c.in the world
d.among them both
Vocabulary 词汇
9 Saliva is a natural ____.(11.1-2)
a.oil in the body
b.snake-poison
c.digestive process
d.body fluid
10 Poison would be ____ to all carnivores.(1.7)
a.an asset
b.a help
c.a necessity
d.a disadvantage
11 Arsenic and strychnine ____ us in different ways.(1.11.11-12)
a.effect
b.result
c.affect
d.cause
12 The nerve poison is thought to be ____(11.15-16)
a.less highly developed
b.more potent
c.more recent
d.less complicated
课后习题答案:
Unit 20 BCADC CCBDB CA
【篇三】Unit 21 课后习题及答案
Multiple choice questions 多项选择题
Choose the correct answers to the following questions.
Comprehension 理解
1 The basis of Western films, as defined by William S.Hart, is ____.
a.contrast
b.conflict
c.evil
d.outlaws
2 William S.Hart's understanding of the West was ____.
a.absurdly romanticized
b.influenced by his contemporaries in Hollywood
c.part of history and mythology
d.based on direct personal experience
3 The basic theme of early Western films ____.
a.concerned survival against Indians
b.was about the clash between civilization and Nature
c.was not appreciated by early audiences
d.was about inheritance
4 The passage suggests that audiences, past and present, like ____.
a.stories about civilization
b.simple living and simple rules
c.impending catastrophe
d.war and bad behaviour
Structure 句型
5 William S.Hart appeared in nothing ____Westerns.(11.1-2)
a.except
b.although
c.only
d.apart
6 Hart devised the protagonist ____ he played inevery film.(1.3)
a.whom
b.which
c.what
d.where
7 Hart actually knew something about the old West ____ he had lived as a child.(11.6-7)
a.to whom
b.which
c.in it
d.in which
8 ____ no period has been more absurdly romanticized, myth and reality did join hands in atleast one arena.(11.8-10)
a.As
b.Because
c.When
d.While
Vocabulary 词汇
9 Hart devised the ____ he played in every film.(11.2-3)
a.leading part
b.fighter
c.cowboy
d.first person
10 His hero was rooted in the mythology of a frontier that had ____.(11.7-8)
a.expanded
b.disappeared
c.become established
d.changed
11 This period has been romanticized in ____ fashion.(11.8-9)
a.an exaggerated
b.a realistic
c.a ridiculous
d.an amusing
12 Men accustomed to struggling for survival were ____ by politicians.(1.11)
a.confused
b.surrounded
c.pursued
d.welcomed
课后习题答案:
Unit 21 BDBBA ADDAB CA
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