首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The reason for not classifying carbon dioxide as a pollutant is that it is a natural component of the atmosphere and needed by p
The reason for not classifying carbon dioxide as a pollutant is that it is a natural component of the atmosphere and needed by p
admin
2012-06-26
41
问题
The reason for not classifying carbon dioxide as a pollutant is that it is a natural component of the atmosphere and needed by plants to carry out biological synthesis. No one would argue that carbon dioxide is a necessary component of the atmosphere any more than one would argue the fact that Vitamin D is necessary in the human diet. However, excess intake of Vitamin D can be extremely toxic. Living systems, be they an ecosystem or an organism, require that a delicate balance be maintained between certain compounds in order for the system to function normally. When the excess presence of one substance threatens the wellbeing of an ecosystem, it becomes toxic despite the fact that it is required in small quantities.
选项
答案
之所以不把二氧化碳列为污染物,是因为二氧化碳是大气的天然成份,植物进行生物合成需要二氧化碳。正如人们普遍认为人的饮食不可缺少维生素D一样,也都认为二氧化碳是大气不可缺少的成份。但是摄入过多的维生素D会有很大的副作用。生命系统,不论是生态系统还是生物,都需要在某些化合物之间保持微妙的平衡,以确保系统功能正常。尽管少量的某种物质是必要的,但当该物质过量出现威胁生态系统的健康时,就具有了毒副作用。
解析
1.第一句的表语从句中有it is a natural component of the atmosphere and needed by plants to carry out biological synthesis,其中it is a...and needed...可理解为needed前面省略了it is,后面的不定式充当目的状语,意义相当于plants need carbon dioxide to carry out biological synthesis。
2.第二句是该段落中最难理解的句子,难就难在如何理解No one would argue that...any more than one would argue...,字面意思是“一个人为……争辩的力度不会超过……,意译就是“对两者相信的程度相同”。
3.第四句。Living systems, be they an ecosystem or an organism...就是“不论是生态系统,还是生物(有机体)”。require后的从句是虚拟语气,动词用原形。excess可当形容词用,相当于excessive。名词quantity number和amount可与介词in连用充当状语,如import oil in large quantities(大量进口石油)或kill the enemy in large numbers(消灭大量敌人)。
转载请注明原文地址:https://kaotiyun.com/show/kqTO777K
0
研究生英语学位课统考(GET)
相关试题推荐
It’sverydifficultto______theexactmeaningofanidiominaforeignlanguage.(2013年10月中国科学院考博试题)
Atierce______wasunderwayoverthequestionofself-governmentforthissmallPacificisland.
Becauseofarecentobstacleinproduction,saleshavedroppedandaccordinglyprofitshave______.(2002年春季上海交通大学考博试题)
She______herselfbitterlyforherbehaviorthatevening.(2004年上海理工大学考博试题)
Weallknowthatinasituationlikethisacoolheadis______.
Watchababybetweensixandninemonthsold,andyouwillobservethebasicideaofgeometrybeinglearned.Oncethebabyhasm
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivide—thedivisionoftheworldintotheinfo(informatio
Nextweek,theEuropeanParliamentwilldebatestringentregulationofanumberofeffectivepesticides.Ifthisregulationisp
TheUnitedNationsdeclaredlastFridaythatSomalia’sfamineisover.Buttheofficialdeclarationmeanslittletothemillions
LivinginthecentralAustraliandeserthasitsproblems,______obtainingwaterisnottheleast.
随机试题
Inwhatwayarethespeaker’sEnglishprogramsdifferent?
腹股沟斜疝和直疝的区别,下列哪项是正确的_______。
下列经济业务事项中,体现重要性要求的有()。
某上市公司2019年的β系数为1.24,短期国债利率为3.5%。市场组合的报酬率为8%,则投资者投资该公司股票的必要报酬率是()。
职工通过本岗位的工作和自治实现对管理的参与,具体形式包括()。
创设幼儿园物质环境时,小班环境要有结构简单、色彩鲜艳、富有感官刺激等特点;中班环境在小班的基础上要突出操作性:大班环境要突出探索性和实验材料的丰富性。这主要体现了幼儿园物质环境创设原则中的()。
开门是一个积极的动作,它本身存在某种________的情趣:进入一种新的时刻,达到一种新的目标,实现一种新的转换。它包含一种人世间极深情感的蓄积与________:重聚、回归、和解、诧异以及长久分离的情人的惊喜。填入画横线部分最恰当的一项是:
A.口内翼下颌皱襞内侧做纵行切口B.口内翼下颌皱襞内侧做横行切口C.下颌角下2cm绕下颌角做弧形切口D.下颌骨下缘下1cm以内做平行切口E.下颌骨下缘下2cm做平行切口广泛颊间隙感染进入颊部脓腔的入口()。
Changesinthewaypeoplelivebringaboutchangesinthejobsthattheydo.Moroandmorepeopleliveintownsandcitiesinst
Societywasfascinatedbyscienceandthingsscientificinthenineteenthcentury.Greatbreakthroughsinengineering,theuseo
最新回复
(
0
)