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.
The use of the phrase "comes in handy" underlined in Paragraph 2 indicates that the process is______.
选项
A、unavoidable
B、predictable
C、necessary
D、successful
答案
C
解析
词义题型。见第二段第四句:This comes in handy for the growth of buds in the earlyspring when leaves are not yet functioning.这对于芽(蓓蕾)在早春的生长很是必要,因为叶在那时还没有起作用。所以comes in handy应表“必要”,所以选项C为答案。
转载请注明原文地址:https://kaotiyun.com/show/SIwO777K
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
InnovationsinMedievalEuropeanAgriculture1.Intheyear1,000CE,Europe’ssocietieswereorganizedunderasystemknown
Physicalactivitiesandintellectualpursuitsarethetwobasicwaysinwhichwespendourleisuretime.Whilemostpeoplehave
CulturalShock"Cultureshock"mightbecalledanoccupationaldiseaseofpeoplewhohavebeensuddenlytransplantedabroad.
Whatdoesthepassagemainlydiscuss?Theauthormentionsthatpublishedmusicisnotconsideredtobefolkmusicbecause
AirPollutionandAcidRainTheincreasingvarietyandprevalenceofpollutionpresentstheworldwithmanyextremelydaunti
Whatpointdoestheprofessormakeaboutcloselyrelatedplantssuchaswheatandbarley?
ResearchpublishedinMay1993bytheDepartmentoftheEnvironment,TransportandtheRegions(DETR)showedthatreducingcoast
WhenHenryarrivedhomeafteraharddayatwork,hiswifewasslept.
Itwasratherstrangehowthehabitsofhisyouthclungtohimstill.Hewas72.
Providingreliefafterthedisasternecessitatedthemobilizationofvastamountsoffood,medicalsupplyandpeople.
随机试题
女性,68岁。原有肺心病病史。受凉后发热伴咳脓痰,发绀加重,次日神志模糊,嗜睡,血压12.0/9.0kPa,无病理反射。患者最可能并发
A.多见于青壮年,非对称性下肢大关节炎症B.对称性多关节炎,累及远端指间关节,类风湿因子阴性,有银屑病史C.多见于50岁以上者,远端指间关节疼痛、变形,有骨性结节D.手关节肿痛,有蛋白尿、抗核抗体阳性E.多见青少年,四肢大关节游走性疼痛,伴有发热及
在结核瘤的鉴别诊断中,首先应该考虑的是
开展全员质量管理的主要手段是()。
金融市场发展对商业银行的促进作用不包括()。
Whattimeofdaycanyouthinkmostquickly?Areyouamorningperson?Ordoesit【C16】______youafewhourstogetyourbraingo
居民委员会向()负责并报告工作。
建设有中国特色社会主义首要的基本问题是( )。
Designofallthenewtoolsandimplementsisbasedoncarefulexperimentswithelectronicinstruments.First,ahuman"guineap
设y=f(x)在(一1,1)内具有二阶连续导数且f"(x)≠0,试证:对于(一1,1)内的任一x≠0,存在唯一的θ(x)∈(0,1),使f(x)=f(0)+xf’(θ(x)x)成立;
最新回复
(
0
)