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
About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists
About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists
admin
2013-11-07
37
问题
About fifty years ago, plant physiologists set out to grow roots by
themselves
in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
The study of isolated roots has provided an understanding of the relationship between shoots and roots in
intact
plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots with organic nitrogen compounds. This
conies in handy
for the growth of buds in the early spring when leaves are not yet functioning. Once leaves begin photosynthesizing, they produce protein, but only mature leaves can "export" protein to the rest of the plant in the form of amino acids.
Which of the following best describes the organization of the passage?
选项
A、The results of two experiments are compared.
B、A generalization is made, and several examples of it are given.
C、The findings of an experiment are explained.
D、A hypothesis is presented, and several means of proving it are suggested.
答案
C
解析
主旨题型。第二段第一句为本文的主旨。而这是植物生理学家通过研究种植在实验瓶中的根,及在此基础上研究根、芽作为植物整体间的关系取得的;本文对此作了较详尽的解释。因此选项C为答案。
转载请注明原文地址:https://kaotiyun.com/show/0IwO777K
本试题收录于:
CATTI三级笔译综合能力题库翻译专业资格(CATTI)分类
0
CATTI三级笔译综合能力
翻译专业资格(CATTI)
相关试题推荐
SOILQUALITY1Soilisarenewableresource,butonlyonaverylongtimescale,asittakeshundredsorthousandsofyearsfo
THEFIVE—SEVENSHIFT1Allmajortheoriesofchildpsychologystatethatchildrenundergoamajorchangebetweentheagesoff
ThefirstpeoplestoinhabitwhattodayisthesoutheasternUnitedStatessustainedthemselvesashuntersandgathers.Sometimes
Whichaspectofcolonialprintingdoesthepassagemainlydiscuss?Broadsidescouldbepublishedwithlittlerisktocolonial
ThefoodcooperativesocietyinBrownUniversityhopestowelcomemorestudentstojointhem.Thefollowingpassageisanannoun
ThemostimportantandmeaningfulacademicsocietyI’vejoinedinschoolisthestudents’computersocietyofmyuniversity.The
WhataretheimplicationsofthetheorythatbananasarrivedinAfrica5,000yearsago?Chooseon2answers.
Evenafterhavingtheirgrandchildrenlivewiththemfortenyears,thecouplefeltthat______childrenthesedayswasthemost
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommunication.Theconvenienceandefficiencyofelec
Whatisintelligence,anyway?WhenIwasinthearmy,Ireceivedakindofaptitudetestthatallsoldierstookand,againstan
随机试题
以下________显示在Word2010窗口的状态栏中。
新民主主义的文化纲领是什么?
善祛经络中之风痰的药是
A、卡马西平B、乙琥胺C、苯妥英钠D、地西泮E、丙戊酸钠癫痫大发作的首选药是
因含罂粟壳而不能过量或长期服用的中成药是
根据我国《宪法》的规定,民族自治地方的自治机关享有()自治权。
销售已计提存货跌价准备的存货,应结转相应的存货跌价准备,同时调整“主营业务成本”或“其他业务成本”。()
下列关于风险评估的说法中,不正确的是()。
秘书在使用计算机时,如发现计算机无法工作,就应填写“()”。
下列表述不正确的是()。
最新回复
(
0
)