新概念英语第四册第二十单元课文词组拓展(教学用)_新概念英语四册词组

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新概念英语第四册第二十单元课文词组拓展

Leon 20 Snake poison 蛇毒

How it came about that snakes manufactured poison is a mystery.Over the periods their saliva, a mild, digestive juice like our own, was converted into a poison that defies analysis even today.It was not forced upon them by the survival competition;they could have caught and lived on prey without using poison just as the thousands of non-poisonous snakes still do.Poison to a snake is merely a luxury;it enables it to get its food with very little effort, no more effort than one bite.And why only snakes? Cats, for instance, would be greatly helped;no running rights with large, fierce rats or tules with grown rabbits just a bite and no more effort needed.In fact it would be an aistance to all the carnivorae--though it would be a two-edged weapon-When they fought each other.But, of the vertebrates, unpredictable Nature selected only snakes(and one lizard).One wonders also why Nature, with some snakes concocted poison of such extreme potency.In the conversion of saliva into poison one might suppose that a fixed proce took place.It did not;some snakes manufactured a poison different in every respect from that of others, as different as arsenic is from strychnine, and having different effects.One poison acts on the nerves, the other on the blood.The makers of the nerve poison include the mambas and the cobras and their venom is called neurotoxic.Vipers(adders)and rattlesnakes manufacture the blood poison, which is known as haemolytic.Both poisons are unpleasant, but by far the more unpleasant is the blood poison.It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a newer product from an improved formula.Be that as it may, the nerve poison does its busine with man far more quickly than the blood poison.This, however, means nothing.Snakes did not acquire their poison for use against man but for use against prey such as rats and mice, and the effects on these of viperine poison is almost immediate.(NCE Book Four)

含有come的词组

around about acro

along

apart come _______ 发生，产生 come _______ 偶然遇见，碰上 come _______ 1.出现，发生；2.进步，进展 come _______ 破碎，崩溃 come _______ 1.苏醒，复原；2.顺便来访

down at

by between down to

come _______ 1.攻击，冲向；2.达到，了解 come _______ 1.分开，离间；2.妨碍（某人做某事）come by 1.得到，获得；2.访问，看望 come down 1.（物价等）下跌；2.落魄，潦倒 come down to 可归结为 off in into on

in for come_______ come _______ come _______ come _______ come _______

1.进入，进来；2.到达；3.当令，流行起来；4.（比赛时）获得……名；5.当选，就任，上台；6.（钱）到手，被收入 受到，遭到

1.进入，加入；2.开始处于；3.得到，继承 1.脱落，分开；2.结果，表现

1.（表示鼓励、催促等）快，走吧；2.进步，进展；3.发生，开始

round / out

/ through / to /

out with come _______ 1.出现，显露；2.出版，发表；3.结果是 come _______ 1.发表，公布；2.吐露，说出，提出；3.展出，供应 come_______ 1.来，前来；2.绕道而来；3.重又来到；4.改变主意，回心转意；

5.（风、船等）转向；6.苏醒，复元；7.让步，服从，照办

come _______ 经历……仍活着，安然度过 come_______ 1.苏醒；2.总数为，结果是；3.涉及，谈到

up

under

up for

up to

up with

up against

come _______ 1.编入，归入（某一项目）；2.受到，遭受（影向、支配等）come _______ 1.出现，发生 2.走上前来 come _______ 突然（或意外）碰到（困难、反对等）come _______ 1.升上来，升起，出现；2.出让，卖出；3.列入 come _______ 比得上，达到（标准等）come _______ 提出，想出，提供

come / go into _______ 实施，生效 come / go into _______ 实施，实行，生效 come to _______ 失败，遭受不幸

come / get to _______ 搏斗起来，开始勉力对付 come to a _______（事情等）达到危急的关头

come to _______ 苏醒过来，开始有生气 come into one’s _______ come into _______ come to one’s _______

显示自身的特点（或价值）

开始活动，开始运转，投入使用

1.恢复理性，醒悟过来；2.（昏迷后）苏醒过来

come to _______

妥协，和解 come _______

come to _______ 显露，暴露 come into _______ come to _______

come / draw to a_______

（预言、期望等）实现，成为现实

出现，形成 动手互殴 渐近结束