Unit 20 BCADC CCBDB CA
新概念英語(yǔ)第4冊(cè)課后習(xí)題:
Multiple choice questions 多項(xiàng)選擇題
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 詞匯
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
