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
专升本
Water on the earth is being continuously recycled in a process known as the hydrologic cycle(水文循环). The first step of the cycle
Water on the earth is being continuously recycled in a process known as the hydrologic cycle(水文循环). The first step of the cycle
admin
2015-07-21
34
问题
Water on the earth is being continuously recycled in a process known as the hydrologic cycle(水文循环). The first step of the cycle is the evaporation of water in the oceans. Evaporation is the process of water turning into vapor, which then forms clouds in the sky. The second step in the water returning to the earth in the form of precipitation(凝结), either rain, snow or ice. When the water reaches the earth’ s surface, it runs off into the rivers, lakes, and the ocean, where the cycle begins again.
Not all water, however, stays on the surface of the earth in the hydrologic cycle. Some of it seeps(渗入)into the ground through infiltration(渗透)and collects under the earth’ s surface as groundwater. This groundwater is extremely important to life on the earth since 95% of the earth’ s water is in the oceans, and it is too salty for humans or plants. Of the 5% on land, only 0.05% is above ground in rivers or lakes. The rest is underground water. This underground water is plentiful and dependable, as it doesn’ t depend on seasonal rain or snow. It is the major source of water for many cities. But as the population increases and the need for water also increases, the ground, water in some areas is getting dangerously low. Added to this problem is an increasing amount of pollution that seeps into the groundwater. In the future with an increasing population and more toxic waste, the hydrologic cycle we depend on could become dangerously unbalanced.
The supply of groundwater is getting low because of______.
选项
A、conservation
B、toxic waste
C、pollution
D、population increase
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/BUTC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
ScientistssaythatplantandanimallifeinthousandsoflakesintheUnitedStatesandCanadahasalreadybeendestroyedbyac
Occasionallyweexperiencewesterlygales,butthe______windsarefromthenortheast.
WhenIarrivedinBirmingham,thesun_____.
Anengineermustknowhowanobjectismadeandof_____materialsitisconstructed.
"Isitamessageofimportance?"Yes,itisamessageofimportanceforeverymanandwomanwho_____.
Thewholeindustrialprocesswhichmakesmanyofthegoodsandmachinesweneedanduseinourdailylives,isboundtocreatea
By【B1】______afewsimpletechniques,parentswhoreadtotheirchildrencangreatlyincreasetheirchildren’slanguagedevelopm
Annawasreadingapieceofsciencefiction,completely______totheoutsideworld.
A、Sheeasilygotnervouswhilespeakinginfrontofothers.B、Shemissedherpsychologyclass.C、Shehadnotfinishedherhomewo
Practiceshouldgohandinhandwiththeory.
随机试题
下列不属于新生儿特殊生理状态的表现是
下列关于贷款分类中“次级”的说法,正确的是()。
下列代数式,先化简,再求值.(1),其中χ=2(2),其中a=.(3)(a2b-2ab2-b3)÷b-(a+b)(a-b),其中a=,b=-1.
法律实施是指人们在社会生活中实际施行法律、运用法律的活动,法律实施的主要方式包括()。
事业单位聘用合同按期限分为短期合同、中期合同、长期合同、项目合同四种类型,其中“项目合同”是指()的合同。
习近平总书记提出,实现中国梦,必须弘扬中国精神。中国精神的核心是()。
酸雨是指PH值低于5.6的大气降水,包括雨、雪、露、霜,造成酸雨,的主要原因是大气中的( )。
VB6.0中RecordSet对象的UPDATE方法作用是______。A)在内存中开辟一个存放新记录的缓冲区B)将数据缓冲区中的内容保存到数据库中C)更改用户屏幕上显示的数据D)更改数据缓冲区中当前行指针的位置
软件设计中,Jackson方法是一种面向数据结构的设计方法,将数据结构表示为()三种基本结构。
TheWhiteHousewasbuiltinWashington______.Theoriginalhomeofthepresidentneededtoberebuilt______.
最新回复
(
0
)