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
In 1798 the political economist Malthus predicted that in time mankind would face starvation, having outgrown the available food
In 1798 the political economist Malthus predicted that in time mankind would face starvation, having outgrown the available food
admin
2013-02-16
62
问题
In 1798 the political economist Malthus predicted that in time mankind would face starvation, having outgrown the available food supplies. Today, a century and a half later, there are still experts who forecast the same global disaster unless urgent measures are taken to prevent it.
By the end of the present century there may well be over five thousand million people living on this globe, ail increase of over fifty per cent of today’s figure. In order to keep pace with this increase in mankind the farmers of the world would have to step up their production of food by at least two per cent every year. Such a rate of increase has never been maintained in any country by conventional methods of agriculture, despite modern mechanization and the widespread use of fertilizers. There are no large worthwhile reserves of potential farmland, remaining, and good fertile land is continually being diverted to industrial use. Moreover, erosion of the soil takes a constant toll.
Intensive research, carried out over many years in all manner of climatic conditions, has produced a revolutionary method of growing crops without using any soil at all. Hydroponics, as this technique is called, may well be the answer to all our food worries. Already it has accomplished wonders in producing huge crops. Hydroponics was once a complicated and expensive business; now it is well out of the experimental stage. Labor costs are far lower than when normal methods of agriculture are employed. In fact, it is a completely automatic system. There is no hard manual work, no digging or plowing, and no weeding to speak of. Yields can be far higher than they are in soil.
Which of the following statements is not true of hydroponics?
选项
A、Hydroponics has created wonders in agriculture.
B、Hydroponics is too complicated and expensive for practical use.
C、Hydroponics is considered a revolutionary method of agriculture.
D、Hydroponics has already been employed in food production.
答案
B
解析
本题考查词义猜测。根据文章最后一段第四句“Hydroponics was once a complicated and expensivebusiness;now it is well out of the experimental stage.”可知,水耕曾经是一项复杂和昂贵的作业方式,但现在它已经是出实验阶段了,即已经大规模使用了。
转载请注明原文地址:https://www.kaotiyun.com/show/QK1O777K
0
考博英语
相关试题推荐
Havinggonethroughallkindsofhardshipsinlife,hebecameamanwithastrong______
Theinternetisgoodatshame.1)Therearecountlesswebsiteswherepeoplecanpostnastycomplaintsaboutex-loversandrudec
Teacherscomplainthatchildren______thesetestswithoutbeingabletowriteadecentessay,solveamulti-stepmathproblemor
Inmostpeople’smind,growthisassociatedwithprosperity.WejudgehowwelltheeconomyisdoingbythesizeoftheGrossNat
ThesoundofthesnakeheadissoftandtemptingandperfectlypitchedtotheearsofyoungChinesewhodreamofabetterlife.4
Ascorchingsun,anendlessseaofsandandawaterless,forbiddinglylonelyland--thatistheimagemostpeoplehaveofdeserts
ThePortuguesegiveagreatdealofcredittoonemanforhavingpromotedseatravel,thatman______PrinceHenrythenavigator
Alaska’sTongassandChugachNationalForestsareAmerica’sfirstandsecondlargestnationalforests______.
Itusedtobesostraightforward.Ateamofresearchersworkingtogetherinthelaboratorywouldsubmittheresultsoftheirres
Beforeabigexam,asoundnight’ssleepwilldoyoumoregoodthanporingovertextbooks.That,atleast,isthefolkwisdom.A
随机试题
简述预防脑疝发生的护理措施。
对比增强磁共振血管造影所采用的序列
患者,男。自青少年时起,经常有鼻腔堵塞、流涕、不适等症状,在五官科检查时,医生考虑患者可能患鼻炎或鼻窦炎,在讨论中,提出了以下问题。鼻窦中开口高于窦底的是
A.蠕虫B.原虫滋养体C.线虫卵D.原虫包囊E.血吸虫卵尼龙袋集卵法适于什么的检查
本病例最可能的诊断是除药物治疗外要注意的是
水泥混凝土施工前检验项目应包括的内容有()。
背景资料清河泵站设计装机流量150m3/s,出口防洪闸所处堤防为1级。招标人对出口防洪闸工程施工招标进行公开招标。有关招标工作计划如下:5月31日提交招标备案报告,6月1日发布招标公告,6月11日一15日出售招标文件,5月16日组织现场踏勘,6月
假如各个标志值都增加5个单位,那么算术平均数会()。
A、Becauseheisdoingaverypromisingjob.B、Becausehisbossdoesn’tallowhimtoquithisjob.C、Becausehecan’tsupporthim
ExchangeRates:ABriefHistoryofExchangeRatesForcenturies,thecurrenciesoftheworldwerebackedbygold.Thatis,apie
最新回复
(
0
)