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
Australia is【21】driest continent in this world. The evaporation rate of rainfall in Australia is【22】. The reason for rapid
Australia is【21】driest continent in this world. The evaporation rate of rainfall in Australia is【22】. The reason for rapid
admin
2011-02-05
24
问题
Australia is【21】driest continent in this world. The evaporation rate of rainfall in Australia is【22】.
The reason for rapid drying-up of water and bare penetrating of the soil of rainfall is that the moisture is absorbed by.【23】
In sandy soils rainwater can【24】
Water is mainly pumped up for【25】
Natural springs are located in some parts【26】
Underground water supplies about 18% of the【27】
The dams store water for a variety of functions:
the rural irrigation【28】
the regulation【29】
the generation【30】
Good morning. This morning we are continuing our look at Australia and its natural problems. Actually dryness, or aridity, as it is generally called by geographers, is probably the most challenging of Australia’s natural problems and so it is very important in this course for you to have a good understanding of the subject. For Australia, water is a precious resource and its wise management is of the greatest importance.
As I have said, Australia is a dry continent, second only to Antarctica in its lack of rainfall. Long hours of hot sunshine and searing winds give Australia an extremely high rate of evaporation, far more than in most other countries. It is estimated that approximately 87% of Australia’s rainfall is lost through evaporation, compared with just over 60% in Europe and Africa and 48% in North America. You generally think of many parts of Australia standing water, that is dams, puddles and so forth, dry up rapidly and some rainfall barely penetrates the soil. The reason for this is that thirsty plants absorb the moisture.
Some parts of Australia are dry because rainwater seeps quickly through sandy soil and into the rock below. In parts of Australia this water, which seeps through the sandy soils collects underground to form underground lakes. Water from these subterranean lakes can be pumped to the surface and lapped and so used for various purposes above the ground. In fact, extensive underground water is too salty to be used for human consumption or for the irrigation of crops. However, most inland farmers do rely on this water for watering their animal and, where possible, to a lesser extent for irrigation.
Underground water can flow very large distances and can be kept in underground reservoirs for a very long time. Water from these underground bubbles to the surface as springs in some parts of the country, and there rare sources of permanent water were vital to early explorers of island Australia, and to other pioneers last century, who used the springs for survival. But in many places levels have fallen drastically through continuous use over the year. This has necessitated the pumping of the water to the surface. Remarkably, underground water sources in Australia supply about 18% of total water consumption. So you can see it is quite an important source of water in this dry land.
So most of the consumption of water in Australia comes from water which is kept above ground. More than 300 dams regulate river flows around the country. The dams store water for a variety of function, the rural irrigation of crops, without which many productive areas of the country would not be able to be farmed ; the regulation of flooding, a serious problem which will be dealt with later in the course; and last but not least, the harnessing of the force of gravity for the generation of electricity. That is all we have for this morning, but you will be able to do further study on this important area in the interested, please come up to the desk and take a copy.
选项
答案
of electricity
解析
转载请注明原文地址:https://kaotiyun.com/show/LWAK777K
本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
相关试题推荐
A、The16thcenturyEuropeanpaintings.B、The16thcenturyAsianpaintings.C、Classicalpaintings.D、Modernpaintings.A
Haveyoueverthoughtaboutinventingsomething?Didyouworrythatyourideawastoostrangeorunrealistic?Well,maybeyoush
Haveyoueverthoughtaboutinventingsomething?Didyouworrythatyourideawastoostrangeorunrealistic?Well,maybeyoush
ApologyMakesRightWhetherusedtorepairold,strainedrelationshipsortolaythegroundworkfornew,productiveones,th
ApologyMakesRightWhetherusedtorepairold,strainedrelationshipsortolaythegroundworkfornew,productiveones,th
Asthesupplyofgeneticallymodified(GM)foodincreases,manypeopleareunawarethatsomefoodtheyareeatingisaproductof
Thesedays,collegelecturehallsintheUnitedStatesarebeingfilledmoreandmorewithfemaleratherthanmalestudents.Wom
What’stherealreasonfortheman’ssymptoms?
1.AssessingDepartmentItisresponsibleforaccurately【21】______thevalueofallrealandpersonalpropertylocatedwithi
WhyhasMarybeenabsentfromclass?
随机试题
管理控制最终是通过()的行动来验证的。
A.上斜肌B.下斜肌C.外直肌D.眼轮匝肌E.瞳孔开大肌动眼神经支配的肌肉是
A、山药B、黄芪C、当归D、鹿茸E、阿胶平补气阴,为治气虚或气阴两虚之佳品的药物是
在利率、现值相同的情况下,若计息期数n=l,则复利终值和单利终值的数量关系是()。
下列项目中,属于费用要素内容的有()。
下列因素中会导致一国货币升值的是()。
卫生部党组书记张茅日前在全国卫生工作会议上指出,2012年要把()作为卫生工作的重要管理目标,合理确定费用增长控制指标,并建立考核机制。
甲、乙两名篮球运动员投篮的命中率分别为0.8和0.75。令每人各投一球,则甲命中且乙未命中的概率为:
Theblind,overweightpatientinthewheelchairhasterriblepaininherbackandburningpaininherlegs.Nowhershoulderhas
Forthispart,youareallowed30minutestowriteashortessayentitledMoreAttentionShouldBePaidtoLeft-BehindChildren.
最新回复
(
0
)