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
52
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
A、Changethewall’scolor.B、Rearrangethefurniture.C、Buysomefinefurniture.D、Hangsomepictures.D
Mostpeoplewouldbe【C1】______bythehighqualityofmedicine【C2】______tomostAmericans.Thereisalotofspecialization,a
Mostpeoplewouldbe【C1】______bythehighqualityofmedicine【C2】______tomostAmericans.Thereisalotofspecialization,a
Readingexpertshavebeeninterestedforalongtimeindiscoveringwhatmakesreadingmaterialdifficult.Agreatdealof【B1】_
Methodsofstudyingvary;whatworks【C1】______forsomestudentsdoesn’tworkatallforothers.Theonlythingyoucandoisex
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silencesaysalot.Theyarepoliteaswellandifyouare
A、Flowers,cardsandclothes.B、Flowersandgoldjewellery.C、Cakes,flowersandcards.D、Cakes,cardsandgoldjewellery.C文中提到
A、Chemistry.B、Architecture.C、Mathematics.D、Biology.A选项均为表示学科的名词表明,本题可能考查某人的专业或上什么课。由男士提到的I’minchemistry可知,男士主修化学,故答案为[A]。
A、Doctorandpatient.B、Daughterandmother.C、Passengerandbusdriver.D、Customerandmerchant.C
A、ToinvestigatethecausesofAIDS.B、ToraisemoneyforAIDSpatients.C、TorallysupportforAIDSvictimsinAfrica.D、Todra
随机试题
A、糖皮质激素B、红霉素C、青霉素D、X线胸片右肺门增大E、X线胸片呈“哑铃状”原发综合征
A、蛋白电泳B、免疫电泳C、免疫固定电泳D、免疫球蛋白定量E、尿本一周蛋白检测M蛋白的筛选试验为
患者男,39岁,边缘性人格障碍患者,在治疗过程中向医生透露准备杀害自己的某一同事的计划,同时要求医生为他保密,此时,医生怎样做才最合乎医德要求()
A公司能否就此提起行政复议及复议机关和被申请人如何确定?A公司能否直接向法院提起行政赔偿诉讼,为什么?
________thestart-upventureisrisky,Mr.Skinnerisstillwillingtoinvest$2millionofisownmoneyinit.
下列表述符合我国《宪法》规定的有()。
《中华人民共和国民法通则》第63条规定:“公民、法人可以通过代理人实施民事法律行为。代理人在代理权限内,以被代理人的名义实施民事法律行为,被代理人对代理人的代理行为,承担民事责任。依照法律规定或者按照当事人约定,应当由本人实施的民事法律行为,不得代理。”试
WecanlearnfromthebeginningofthetextthatdoctorsinPhiladelphiaBymentioning"double-dipping"(Paragraph4),theauth
下面c++标识符中正确的是()。
A、Hedoesn’tmindthetraffic.B、Hetakesthebustoschool.C、Hehastostandonthebusifhetakesittoschool.D、Hewantst
最新回复
(
0
)