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
A、To let out clean gas. B、To take in harmful gas. C、To use various plants. D、To let the air flow freely. C短文末句明确提到,使空气清新的最有效方法就是
A、To let out clean gas. B、To take in harmful gas. C、To use various plants. D、To let the air flow freely. C短文末句明确提到,使空气清新的最有效方法就是
admin
2017-12-07
72
问题
For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse. [13]Indoor air pollution can cause a person to feel tired, to suffer eye-pain, headache and other problems. Some pollutants can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution. People began to notice the problem in the early 1970s. When builders began making houses and offices, they did not waste energy. [14]To do this they built buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases. As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for buildings—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and through its tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. [15]So the most effective way to clean the air is to use different kinds of plants.
13.According to the speaker, what problem may indoor air pollution bring to people?
14. What causes the indoor air pollution according to the speaker?
15. What is the most effective way to clean the air?
选项
A、To let out clean gas.
B、To take in harmful gas.
C、To use various plants.
D、To let the air flow freely.
答案
C
解析
短文末句明确提到,使空气清新的最有效方法就是使用各种植物,因此C正确。
转载请注明原文地址:https://jikaoti.com/ti/PRNFFFFM
0
大学英语六级
相关试题推荐
中国姓氏的来源多种多样,有的来源于地名,有的来源于官职.有的来源于职业。
团购是一种新型的购物方式,顾名思义就是指很多人一起购买同一产品,旨在加大与卖方的谈判能力以获得优惠的购买价格。随着中国电子商务的繁荣和发展,网络团购在中国网民中流行起来,已经成为团购的主要形式。它方便、快捷、价格低、不受地域限制。目前中国的很多网站都在尝试
Forthispart,youareallowed30minutestowriteashortessayentitledHowtoCopewithGraduationStress?Youshouldwritea
AstudyconductedbyanAustralianscienceagencyhasdiscoveredsignsthatthecountry’sancientAboriginesmayhavebeenthew
FeedingtheMassesaLoadofManureTheGreenRevolutionMyth,NormanBorlaug,andWorldHunger[A]Mostpeopledon’tkno
Manycountrieshaveaholidaytocelebrateworkers’rightsonoraroundMay1,butLabourDayinCanadaiscelebratedonthefir
Inthe1920sAmericaenjoyedwhatwastobecomeknownas"anAgeofExcess".From1921-1929manufacturingoutputincreasedwith
A、800years.B、400years.C、550years.D、2,000years.D细节题。对话中谈到据文献记载,最古老的红杉树已有2000多年的历史了。
A、HehadtoattendProf.Smith’slecture.B、Hehadtogotoseethedentist.C、Hehadtowaitforanemergencycall.D、Hehadto
Untilrecently,themedicalcommunitybelievedthatmosthearinglosswascausedbyhearcellsintheeardegradingasweage.B
随机试题
为就业者安排合适工作,应作何种检查对职业病患者应作何种检查,以合理安排工作
下列关于泡沫灭火系统的说法错误的是()。
下列关于城镇土地使用税的计税依据,说法正确的有()。
()的特点是油脂、悬浮物和有机物含量高。
下列各项属于妇女贫困表现形式的有()。
关于V模型内容的陈述,表达不正确的是______。A)V模型反映出测试活动与分析设计活动的关系B)V模型指出,单元测试和集成测试应当检测程序的执行是否满足软件设计的要求C)系统测试应检测系统功能、性能的质量特性是否达到系统要求的指标D)文档
对于软件测试,从是否需要执行被测软件的角度,可以分为静态测试和动态测试。代码检查属于【】测试。
Below600feetoceanwatersrangefromdimlylittocompletelydark.
Icanthinkofnobettercareerforayoungnovelistthantoforsomeyearsasub-editoronaratherconservativenewspaper.The
______canhelpbutadmitthatdrasticchangeshavetakenplaceinChinasincetheeconomicreformin1979.
最新回复
(
0
)