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
Let us consider what science and technology have to contribute to the food problem. The simplest way to increase food produ
Let us consider what science and technology have to contribute to the food problem. The simplest way to increase food produ
admin
2010-02-17
36
问题
Let us consider what science and technology have to contribute to the food problem.
The simplest way to increase food production, one might suppose, is to bring more land 【C1】______ cultivation and put more people to work on it. Some of the underdeveloped countries have resorted to this 【C2】______ approach, without notable success. It contains several fallacies. For one thing, it usually means 【C3】______ into marginal lands where the soil and climatic conditions give a poor 【C4】______ . Cultivation may quickly deplete this soil,【C5】______ it for pasture or forest growth. It is often possible, of course, to turn such lands into useful farms by agricultural 【C6】______ ; for instance, a sophisticated knowledge of how to use the available water【C7】______ an irrigation system may reclaim semi-arid grasslands for crop-growing. But the cultivation of marginal lands i6 in any case unsuccessful【C8】______ it is carried out by farmers with a centuries - old tradition of experience or by modern ex pelts with a detailed knowledge of the【C9】______ conditions and the varieties of crops that are suitable for those conditions. Such knowledge is【C10】______ absent in the underdeveloped countries.
【C11】______ , we know that highly developed countries have not increased the【C12】______ of acres under cultivation, 【C13】______ on the contrary have 【C14】______ their marginal lands and steadily reduced the proportion of the population engaged in farming. Efficient farming【C15】______ concentration on the most efficient lands, and it results in greater production with【C16】______ people. The problem of the underdeveloped countries, then is to increase the【C17】______ of their farms and farmers. This would allow them to industrialize and to feed their people more adequately. It is not easy to【C18】______ , how ever. The farmers are conservative and resistant to change【C19】______ their methods of cultivation. The underdeveloped countries are greatly in need of studies and experiments to help them to【C20】______ modern agricultural methods to their own conditions.
【C8】
选项
A、before
B、unless
C、although
D、since
答案
B
解析
此题考查从属连词的用法。解题关键在于对主句的理解,其中“in any case(不管怎样;无论如何)”和带有否定意义的“unsuccessful”是关键词。主句“边远荒地的耕种绝不会成功”与从句“有经验的农民和专家”有何关系?可见从句为主句的条件,具有否定意义的从属连词unless“如果没有……;除非”符合题意。
转载请注明原文地址:https://kaotiyun.com/show/hknK777K
0
专业英语四级
相关试题推荐
TheCloningTechnologyI.Thedifferencebetweena【T1】________colonyandcloningamammalA.Clarifytheillusion:scientis
HotSpotsinCrossCulturalCommunicationI.【T1】________Conversations—Modesofaddress—【T2】______—Levels
PassageOne(1)Themultimilliondollarbraintrainingindustryisunderattack.InOctober2014,agroupofover100emine
Weoftenhearemployersandbusinessleaderslamenttheunfortunategapbetweenwhatstudentslearnincollegeandwhattheyar
Dogsreallyareourbestfriends,accordingtoaSwedishstudythatsayscanineownershipcouldreduceheartdisease.Astudyo
Ican’t______whathashappenedtothevegetables,fortheywerefreshlypickedthismorning.
Theabilitytostoreknowledgemakescomputersdifferentfromeveryothermachine______invented.
Hewas______totellthetrutheventobisclosestfriend.
Wheredidthecustomergetthesweater?
随机试题
受托人或者被聘用人管理个人独资企业的依据是:()
用电流表测得的交流电流的数值是交流电的()值。
A.剪接B.甲基化修饰C.两者皆有D.两者皆无原核rRNA前体加工通常需要经过
设计与施工分离,施工单位“按图施工”,基本上处于被动地位,在一定程度上影响其()的发挥。
标的证券为股票的,不符合的条件有()。
全国人民代表大会常务委员会对宪法和法律的解释是()。
[*]
极坐标系下的累次积分f(rcosθ,rsinθ)rdr.
【说明】某公司采用100M宽带接入Internet,公司内部有15台PC机,要求都能够上网。另外有2台服务器对外分别提供Web和E-mail服务,采用防火墙接入公网,拓扑结构如下图所示。
数据流图用于抽象描述一个软件的逻辑模型,数据流图由一些特定的图符构成。下面图符名标识的图符不属于数据流图合法图符的是
最新回复
(
0
)