首页
登录
职称英语
[originaltext] For years scientists have been worried about the effects of a
[originaltext] For years scientists have been worried about the effects of a
游客
2024-04-15
69
管理
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. 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.[21]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. So the most effective way to clean the air is to use different kinds of plants.
20. According to the speaker, what problem may indoor air pollution bring to people?
21. What causes the indoor air pollution according to the speaker?
22. 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
短文未句明确提到,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://tihaiku.com/zcyy/3556935.html
相关试题推荐
Scientistshavebegunusingsatellite-basedsystemstopredictvolcanicerup
Scientistshavebegunusingsatellite-basedsystemstopredictvolcanicerup
[originaltext]Everyyear,peopleinAmericauseenergyequaltoover30mil
[originaltext]Everyyear,peopleinAmericauseenergyequaltoover30mil
[originaltext]Ifsheernumbersprovideanyproof,America’suniversitiesar
[originaltext]Youprobablyknowwhatamobileis,butthemobileI’mtalkin
[originaltext]Youprobablyknowwhatamobileis,butthemobileI’mtalkin
[originaltext]W:Iwonderifyoucouldtellmealittlebitaboutyourjobasa
[originaltext]W:Iwonderifyoucouldtellmealittlebitaboutyourjobasa
[originaltext]W:Charles,asasinger,doyouevermakeyourselfcrywhenyous
随机试题
Thefollowingisanadvertisement.SecurityandPrivac
持续时间duration
运维的主要工作是保证系统的可用性和稳定性,以下关于运行维护的叙述中,不正确的是(
导游人员的讲解用语和动作行为要文雅谦恭,让游客获得美的享受。这体现了导游讲解中的
在学期末,冯老师组织学生举办班级美术作品展,撰写了评语,并给出分数,充分肯定了学
证券()是指证券公司代发行人发售证券,在承销期结束时,将未售出的证券全部退还给
慢性肾炎治疗的主要目的是A.消除蛋白尿 B.消除血尿 C.防止或延缓肾功能进
2012年1-4月,该市平均每天观看电影的观众超过10万人次的月份有几个?
通常情况下,下列商业银行资产的流动性自高至低排序正确的是()(1)国债(2)同业
下列选项中,不属于培训与开发目的的是( )。A.帮助员工胜任本职工作 B.提
最新回复
(
0
)