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、Because burning them may cause fire accidents. B、Because burning them may cause air pollution. C、Because burning them may caus
A、Because burning them may cause fire accidents. B、Because burning them may cause air pollution. C、Because burning them may caus
admin
2013-09-26
49
问题
Burning fallen leaves used to be standard practice across North America, but(29)most districts now ban or discourage this practice due to the air pollution it causes.
What’s more, because of the moisture that is usually trapped within leaves, they tend to burn slowly and thus generate large amounts of particles in the air, such as bits of dust, smoke and other solid materials. These particles can reach deep into lung tissue and cause coughing, chest pain, shortness of breath and other breathing problems.
Individual leaf fires from time to time usually don’t cause any major pollution, but multiple fires in one geographic area can cause concentrations of air pollutants that exceed federal air quality standards. According to the U. S. Environmental Protection Agency(EPA), several leaf and yard waste fires burning simultaneously in a particular place can cause air pollution which equals that from factories, motor vehicles and lawn equipment.
On the contrary, leaves can be made fertilizer, which is the most eco-friendly alternative to burning. Dry leaves alone will take a long time to break down, but mixing in green plant materials, such as grass, will speed up the process. Sources of nitrogen, such as livestock wastes or commercial fertilizer, will also help.
Another option is to chop leaves for use as cover for your lawn or to help protect garden and landscape plants. But before you add no more than a two-to-three-inch layer of leaves around actively growing plants, chop the leaves first so they don’t prevent air from reaching roots.
29. Why do most cities discourage burning fallen leaves?
30. Why can fallen leaves cause air pollutants?
31. What is the most eco-friendly way to deal with fallen leaves?
选项
A、Because burning them may cause fire accidents.
B、Because burning them may cause air pollution.
C、Because burning them may cause people out of breath.
D、Because burning them may cause water pollution.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/q927777K
0
大学英语六级
相关试题推荐
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic:SalaryorInterest.Youshouldwrite
WhensoccerofficialsintheUnitedStateslearnedtheirnationwasselectedto【B1】______the1994worldCupfinals,theyreacte
A、Becausehehaspneumonia.B、Becausehiswifetoldhimto.C、Becausehefeelstired.D、Becausehiswifefeelstired.C
Readingexpertshavebeeninterestedforalongtimeindiscoveringwhatmakesreadingmaterialdifficult.Agreatdealof【B1】_
A、Beingoutdoors.B、Thebadweather.C、Thedangerofdrivingatnight.D、Dealingwithdifferentpeople.C对话中男士问女士工作中有没有unpleasan
Eachculturehasitsownformofacceptablegreetingbehavior,usuallybasedonthelevelofformalityfoundwithinthesociety.
EversinceALGoreinventedit,theInternethasbeenaparadiseforthosewithacreativeattitudetofacts.Students,forexam
A、Bobistheman’scollegefriend.B、Bobisafarmowner.C、Bobcannevergetoverhisloveforagirl.D、Bobwasoncethecapta
Itmightbesupposedthatefficiencyshouldbeachievedonlyifseveralpeoplecooperatetosolveaproblem.Suchresultsareby
A、ToinvestigatethecausesofAIDS.B、ToraisemoneyforAIDSpatients.C、TorallysupportforAIDSvictimsinAfrica.D、Todra
随机试题
试述处于不同象限内的SBA,其投入与收入的关系的区别
A.紫外-可见光分光光度法B.原子吸收分光光度法C.荧光分光光度法D.火焰分光光度法E.反射分析法干化学分析技术应用的是
患者,女,33岁。因粘连性肠梗阻腹痛伴呕吐2天入院,测血钾为3mmol/L,给予静脉补充钾盐。其护理哪项是错误的
A.血浆糖化血红蛋白B.血浆糖化血清蛋白C.空腹血糖达5.6mmol/LD.餐后2小时血糖达11.1mmol/LE.血浆胰岛素释放水平()可确诊糖尿病。
无尿是指24小时尿量少于
下列可按影子价格计算的有()。
《临时约法》颁布于()。
2018年10月30日,金庸先生辞世。11月2日,中共中央总书记、国家主席习近平对金庸先生的逝世表示哀悼。对其亲属表示慰问。
下面的程序的功能是将11到2011之间的素数插入数据库prime,程序中的错误语句是CREATETABLEprime(datf)n=11DOWHILEn
A、 B、 C、 B本句是确认飞机乘务员是否友善的反意疑问句。
最新回复
(
0
)