首页
登录
职称英语
Given that 8 percent of food crops grows faster on farms using grou
Given that 8 percent of food crops grows faster on farms using grou
游客
2025-02-22
8
管理
问题
Given that 8 percent of food crops grows faster on farms using groundwater
than the aquifers are replenished, and many large rivers are so heavily diverted
that they do not reach the sea for much of the year, researchers believe
Line freshwater sources-underground aquifers and rivers-are stressed. Better
(5) management of soil and water and creative cropping patterns can boost
production from rainfall-watered cropland, but the heaviest burden will fall on
irrigated land. At present, most farmers irrigate their crops by channeling
water down their fields in parallel furrows.
One alternative, drip systems, enables farmers to deliver water directly to
(10) the plants’ roots drop by drop, nearly eliminating waste by distributing water at
low pressure through a network of perforated plastic tubing installed on or
below the surface of the soil, where it then emerges through small holes at a
slow but steady pace. Because the plants enjoy an ideal moisture environment,
drip irrigation usually offers the added bonus of higher crop yields. Another
(15) alternative, sprinklers, can perform almost as well as drip methods when
designed properly, but traditional high-pressure irrigation sprinklers spray
water high into the air to cover as large a land area as possible, and the more
time the water spends in the air, the more of it evaporates before use.
Despite the payoffs, the higher costs of these technologies relative to
(20) simple flooding methods have been a barrier to their spread, and so has the
prevalence of national water policies that discourage rather than foster efficient
water use. Many governments have set very low prices for publicly supplied
irrigation, leaving farmers with little motivation to invest in ways to conserve
water or to improve efficiency and most authorities have also failed to regulate
(25) groundwater pumping, even in regions where aquifers are over-tapped.
Therefore, farmers might be inclined to conserve their own water supplies if
they could profit from selling the surplus, but this practice is often discouraged.
Efforts aside from irrigation technologies are also conducive to the
reduction of agricultural demand for water; for instance, measurements of
(30) climate factors such as temperature and precipitation can be fed into a computer
that calculates how much water a typical plant is consuming, and farmers can
use this figure to determine, quite accurately, when and how much to irrigate
their particular crops throughout the growing season. But the most effective, if
unlikely way, to do more with less water is to reconfigure our diets, especially
(35) the typical North American diet, which, with its large share of animal products,
requires twice as much water as diets common in many Asian and some
European countries. Eating lower on the food chain could allow the same
volume of water to feed two Americans instead of one, and despite the resultant
loss of nutrition, this may be the only recourse for countries serious about
(40) reducing their aquifer strain. [br] Which of the following can be inferred from the passage concerning the relationship between traditional irrigation methods and modern ones?
选项
A、Traditional irrigation methods tend to come at a lower expense than more modern ones, which are generally dependent on technology.
B、Traditional methods may best be used in areas where the technological knowledge necessary for using modern techniques is limited.
C、Modern methods, unlike traditional ones, can only help land whose primary water source comes from irrigation, not rainfall.
D、Modern methods rely more heavily upon groundwater tapping, which itself depletes the aquifer.
E、Traditional methods can be performed without the tedious and difficult calculation of climate factors.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3967802.html
相关试题推荐
Giventhat8percentoffoodcropsgrowsfasteronfarmsusinggrou
Giventhat8percentoffoodcropsgrowsfasteronfarmsusinggrou
Giventhat8percentoffoodcropsgrowsfasteronfarmsusinggrou
Giventhat8percentoffoodcropsgrowsfasteronfarmsusinggrou
BecausetheymakeupjustasmallpercentofallobjectsthatfalltoEarth,car
ThattheThirdBattalion’sfifty-percentcasualtyratetransformeditsassaulto
Arecentsurveyshowsthat,whileninety-fourpercentofcompaniesconductingma
AlthoughthepercentageoffirstgradersinAlmariawhowereexcellentreade
Thetableshowshouseholdspendingonvariousitemsasapercentageofthe
Thetablebelowgivesinformationaboutthepercentageoflandcoveredbyfo
随机试题
如何更好地实施讲授法?
任何人发现传染病人或者疑似传染病病人时应该A.尽量的远离他们,避免和他们正面相对
商业性机构网站的域名类型是( )。A.gov B.org C.com D
充填采矿法的成本高,房柱采矿法的效率低、资源损失大,只有在不得已的情况下才采用。
基金跟踪与评价的核心是()。A.对销售业绩的维护 B.对客户关系的维护
荆芥生用善于A:活血化瘀B:祛风解表C:止血D:止泻E:健脾燥湿
审计机关在公布审计结果时,可以公布的信息有:A.正在调查.处理过程中的事项
2020年第二季度,全国货物周转量约比第一季度增长了:A.40% B.51
就财政政策本身而言,其焦点是如何处理( )问题。A.财政收入 B.财政支出
(2017年真题)传输速率超过100Mbps的高速应用系统,布线距离不超过90m
最新回复
(
0
)