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
2015-10-13
93
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/sRwO777K
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
Connecticutwasthefifthoftheoriginalthirteenstates______theConstitutionoftheUnitedStates.
Forthistask,youwillwriteanessayinresponsetoaquestionthatasksyoutostateandsupportyouropiniononatopic.You
______.widelyusedinthechemicalindustry,sodiumcarbonateisprincipallyconsumedbytheglassindustry.
A、Theshirtbelongstohersister.B、Theshirtwaspurchasedduringatrip.C、Sheboughtasimilarshirtfortheman.D、Theshir
Somepeoplechoosefriendswhoaredifferentfromthemselves.Otherschoosefriendswhoaresimilartothemselves.Comparethea
AsasourceofApower,electricityBhadnorivalbecauseitisCclean,silent,andDcanbeturnedonandoffinstantly.
AThebestknownmimosaisthesensitiveplant,BwhoseleavesfoldupandCcollapsesundersuchDstimuliastouch,darkness,ord
Foralltheirprotestations,theyheededthejudge’sruling.
Itwasnotuntilshearrivedattheclassroomsherealizedshehadforgottenhercoursebook.
IalwaysrecalledthatunforgettableNovemberday—atintervals,whileturningovertheleavesofmybook,theaspectofthatw
随机试题
DeepinsideamountainnearSweetwaterinEastTennesseeisabodyofwaterknownastheLostSea.ItislistedbytheGuinness
在进行地面水流行病学调查时,应调查下列哪一项
毓麟珠多用于治疗
在医疗法废弃物中,不属于高危险废弃物的为()。
某项目招标,经评标委员会评审认为所有投标都不符合招标文件的要求,这时应当( )。
一般资料:求助者,女性,46岁,中学教师。案例介绍:求助者因为母亲去世痛苦,主动前来寻求帮助。下面是心理咨询师与该求助者的一段咨询对话:心理咨询师:通过我刚才的介绍,您已经对心理咨询有了初步的了解,今天您来想得到什么心理帮助呢
我国现已发现的最早的独幅人物画是《________》,其作用是________。
Wehadn’texpectedapowercutsowewereastonishedwhenthewholehousewas______intodarkness.
【S1】【S3】
A、Theyrealizetheimportanceofkeepingfit.B、Therearetoomanytrafficjams.C、Theeconomyisslowingdown.D、Gasisinshor
最新回复
(
0
)