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
32
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
seep quickly
解析
转载请注明原文地址:https://jikaoti.com/ti/KItMFFFM
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
ApologyMakesRightWhetherusedtorepairold,strainedrelationshipsortolaythegroundworkfornew,productiveones,th
PositionAvailableHigh-levelsecretaryneededforafirmlocatedincentralLosAngeles.Applicantsshouldhavegoodcommun
PositionAvailableHigh-levelsecretaryneededforafirmlocatedincentralLosAngeles.Applicantsshouldhavegoodcommun
Asthesupplyofgeneticallymodified(GM)foodincreases,manypeopleareunawarethatsomefoodtheyareeatingisaproductof
Thesedays,collegelecturehallsintheUnitedStatesarebeingfilledmoreandmorewithfemaleratherthanmalestudents.Wom
Whendochildrenstarttotalk?Ifyouaskagroupofparentswhenthishappened,mostwillsay"aroundtwelvemonthsofage".Th
Studentsfromwhichuniversityarethesecondmostemployableintheworld?
AustraliahaspinedanappealforaidtoSomaliabecause________.
63.Theinvestigationoftheaccidentlastedforalmosttwoyears.Sand:aschildrenweplayonitandasadultswerelaxon
WhyhasMarybeenabsentfromclass?
随机试题
个性心理特征
根据口表体温的高低,高热是指体温
患者,男性,35岁因高热持续不退伴有腹泻、血便,经血液和大便培养,确诊为“伤寒”收住院。恢复期食物选择应禁选
下列关于货币的说法,错误的是(.)。
某水利工程一单项工作直接工程费与间接费之和为300元,根据《水利工程设计概(估)算编制规定》(水总[2002]116号文),企业利润应为()元。
最早提出转移支付概念的是()。
咨询的终极目标与具体目标的关系是()。
(2010年真题)陈某夫妇靠捡拾垃圾为生,几年中“捡回”5名残疾弃婴,并筹钱为孩子们治病。当地民政部门认为,陈某夫妇不具备法定收养条件,且未依法办理收养手续,属非法收养。该事件经媒体报道后,在社会上引起强烈反响。很多人对相关法律规定表示无法理解,认为陈某夫
Whenyouspeakonthetelephone,youcannotuseyaurfacial(面部的)expression,eyecontactandgesturestohelpcommunicateyour
A、Eighthours.B、Twohours.C、Anhourandahalf.D、Halfanhour.C男士决定I’dbettertake6:30,这样他可以从容地赶到机场,女士将航班的行程时间告诉了他:Theflig
最新回复
(
0
)