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
2012-07-17
42
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, an increase of over fifty percent on today’s figure. In order to keep pace with this increase in mankind the farmers of the world will have to step up their production of food by at least two percent 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 changed into industrial use. Moreover, erosion of the soil takes a constant toll (损失).
Intensive research, carried out over many years in all manners of climate conditions, has produced a revolutionary method of growing crops without using any soil at all. Hydroponics (水栽 法), 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 ploughing, 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 is still too complicated and expensive for practical use.
B、Hydroponics is considered a revolutionary method of agriculture.
C、Hydroponics has created wonders in agriculture.
D、Hydroponics has already been employed in food production.
答案
A
解析
本题是一道判断是非题。问关于水栽法,下面哪个选项是不正确的。根据文章第三段第三句至段末,水栽法曾经很复杂而且成本很高,但现在这种方法已不再处于试验阶段了。利用这种栽培方法,劳动力的成本远远低于一般农业栽培法的成本。事实上,水栽法是一种完全自动的体系。无需艰苦的手工劳动,无需耕地、犁地,更不需要除草。而产量却能比土栽法高出许多。因此,本题的正确答案应是A“水栽法仍然太复杂昂贵,不实用”。
转载请注明原文地址:https://kaotiyun.com/show/OoXO777K
0
在职攻硕英语联考
相关试题推荐
______springsnotoutoftrueanddeepadmiration,butmoreoftenoutofaself-seekingwishtoidentifywithsomeoneimportant
Thewaythatpeoplespendtheirmoney,andtheobjectsonwhichtheyspendit,arethelastareaswherefreechoiceandindividu
DuringMcDonald’searlyyearsFrenchfriesweremadefromscratcheveryday.RussetBurbankpotatoeswere【C1】______,cutintosh
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
AnIndiananthropologist,ChandraThapar,madeastudyofforeigncultures,whichhadcustomssimilarto【C1】______ofhisnative
Cultureisactivityofthought,andreceptivenesstobeautyandhumanefeeling.【C1】______ofinformationhavenothingtodowith
Starvationprobablydoesn’tsoundlikeakeytolivingwellintooldage.Butasstrangeasitseems,calorierestriction,done
It’sdifficulttobegreatwithoutbeing______:adoctorshouldneverbelittleapatient’sconcerns,regardlessofhowtrivial
Hospitals,hopingtocurbmedicalerror,haveinvestedheavilytoputcomputers,smartphonesandotherdevicesintothehandso
随机试题
企业的流动资产和存货之差与流动负债之比是()
一位成年男性病人因胆囊结石、胆囊炎,行腹腔镜胆囊切除术,术后恢复正常饮食。术后第4天,患者突然出现全腹疼痛、恶心、低热。白细胞数升高。X线腹平片显示肠梗阻征象。该病人的可能处理下列哪一项最直接
某女性,25岁,闭经3个月,阴道出血2个月,查:Hb70g/L,阴道前壁有一紫蓝色结节,大小约4×3cm2,宫颈松,子宫增大如孕18周大小,尿妊娠试验>1:512,应考虑
女,78岁。跌倒右髋受伤2h,局部疼痛,活动受限,患肢缩短,轴向叩击痛(+)。X线片显示右股骨颈基底部骨皮质连续性中断,断端嵌插,:Pauwels角25°,一般状态差,既往高血压、肺心病、糖尿病病史30余年,心功能Ⅳ级,最佳治疗方案是
患者,男性,53岁。饮酒史25年,每天饮酒约250g。近1个月双下肢远端感觉运动减退,手足麻木、烧灼感、无力,来院就诊。查体:跟腱反射消失。考虑该患者出现了慢性酒精中毒的
建设单位管理费是指建设工程从立项、筹建、建设、联合试运转、竣工验收交付使用及后评价等全过程管理所需的费用。内容包括建设单位开办费和( )。
下列属于我国资产评估准则体系框架的特点的是()。
某国有工业公司地处市区,2003年度有关占用土地情况如下:(1)公司办的学校、幼儿园和医院占地面积2000平方米。(2)厂区内的绿化用地600平方米,厂区外的公共绿化用地5000平方米。(3)本年4月1日,将一块2000平方米的土地出租给某企业使用。
社会主义发展道路问题是邓小平关于怎样建设社会主义问题的论述的核心。()
PublichealthofficialsgrapplingwiththeobesityepidemichavedebatedawiderangeofapproachestohelpingslimtheAmerican
最新回复
(
0
)