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
These days, many large city buildings are equipped with their own air-conditioning systems. These systems help keep the building
These days, many large city buildings are equipped with their own air-conditioning systems. These systems help keep the building
admin
2015-01-31
68
问题
These days, many large city buildings are equipped with their own air-conditioning systems. These systems help keep the buildings cool, but they can also damage the environment. Since they use a lot of electricity, for instance, they contribute indirectly to global warming. In addition, the water that flows through the systems is often cooled using chemicals called chlorofluorocarbons, or CFCs, that are believed to damage the Earth’ s ozone layer. Recently, though, a system has been built in the city of Toronto, Canada, that cools buildings with little damage to the environment.
In the traditional air-conditioning systems found in most large buildings, water is pumped through the building in a continuous cycle. The water is first cooled to a temperature of 4°C in machines called chillers. It is then sent to individual units that cool the air in each room. As the water flows through the building, it gradually becomes warmer. Finally, it reaches the roof, where it is left to cool down naturally in a water tower. After that it is returned to the chillers, where the cycle begins again.
Toronto lies on the shore of Lake Ontario, one of North America’s Great Lakes, and the new system makes use of cold water taken from about 80 meters below the surface of the lake. At this depth, the water in the lake remains at 4°C all year round. This is exactly the temperature to which the water in air-conditioning systems is cooled. However, the water from the lake is not pumped directly into the air-conditioning systems. Instead, it is used to cool the water that is already inside the air-conditioning systems. After that, the lake water is added to the city’s ordinary water supply.
Enwave, the company that developed this deep-lake cooling system, says that it uses 75 percent less energy than traditional air conditioning. And since no CFCs are used, no damage can be caused to the ozone layer. Not every city is located next to a large lake, but experts believe that systems like the one being used in Toronto could be built elsewhere by using other natural sources of cold water.
What is one problem with traditional air-conditioning systems?
选项
A、The chemicals they use sometimes pollute the water supply.
B、They often damage the buildings that they are trying to cool.
C、There are not enough CFCs in the world to cool all the buildings.
D、The method they use to cool water is thought to harm the ozone layer.
答案
D
解析
细节题。短文第一段指出传统的空调系统会对环境造成伤害.其中一个危害就是In addition,the water…using chemicals called chlorofluorocarbons…believedto damage the Earth’s ozone layer.即在水冷却过程中使用的CFCs会破坏地球的臭氧层。故选D。
转载请注明原文地址:https://kaotiyun.com/show/wwq7777K
0
大学英语四级
相关试题推荐
A、Thewomanshouldspendmoretimeonexercise.B、Thewomanshouldtryotherwaystoloseweight.C、Thewomanshoulddomoreexe
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreadersarenotespeciallysmart.Anewstudybyres
EarlierthisyearImetwithagroupofwomeninMatela,asmallfarmingvillageinTanzania,andwediscussedsomethingthat’s
ABriefHistoryofOnlineShoppingA)WhenAmazon.comopenedforbusiness15yearsago,itwasnothingmorethanafewpeoplepac
BarackandMichelleObamaunderstandtheheavyburdenofstudentloandebt.TheObamasdidnotpayofftheirstudentloansuntil
A、Byshowinghercleandrivingrecord.B、Bythreadinganeedle.C、Bylookingforagreatlawyerforherself.D、Bychallengingth
A、Imitatewhatyourhostandhostessdo.B、Dowhatyouusuallydoathome.C、Avoidlookingafteryourownneeds.D、Knowaboutth
ThePeakTimeforEverythingA)Couldyoupackmoreintoeachdayifyoudideverythingattheoptimaltime?Agrowingbodyofre
Wouldn’titbegreatifyoucouldjustlookupattheskyandreadtheweatherforecastrightaway?Well,youcan.Theforecast
A、Ahousewife.B、Anurse.C、Ateacher.D、Astudent.D推理题。根据文章中女士的话wellyouknowhow…withmidtermsandeverything可知她要准备期中考试,因此可以推
随机试题
下列各组脉象中。平人可见的脉象是
强心苷治疗心衰的重要药理学基础是
除圆管涵和箱涵外,单孔跨径小于_________的泄水或通行的小型构造物是涵洞。()
细水雾灭火系统的特性主要有()。
日食与月食都是自然现象,日食、月食的成因只与日、地、月三个天体的几何位置有关。()
运行OSPF协议的路由器每10s向它的各个接口发送Hello分组,接收到该分组的路由器就知道了邻居的存在。为了避免路由信息被重复发送,需要给路由信息包编号。假设每秒钟传一次路由信息,为确保路由信息包的编号在一年内不重复使用,则编号的最短长度应为()
在Access数据库中,如果窗体上输入的数据总是取自表或查询中的字段数据,或者取自某固定内容的数据,可以使用【】控件。
接收并阅读由xuexq@mail.neea.edu.cn发来的E-mail,并将随信发来的附件以文件名dqsj.txt保存到考生文件夹下。
A、想散步B、想现在下车C、前面堵车了D、没拿到驾照B
Ourdecisiononwhethertoboostourlongorshortpositions_______onanychangeinthedirectionofthemarket,usuallydrive
最新回复
(
0
)