首页
登录
职称英语
[originaltext] Burning fallen leaves used to be standard practice across Nor
[originaltext] Burning fallen leaves used to be standard practice across Nor
游客
2023-08-27
57
管理
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 they burn very fast.
B、Because they have water inside.
C、Because people tend to burn them at the same time.
D、Because people don’t bum them thoroughly.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2961664.html
相关试题推荐
[originaltext]JaimeEscalantewasconsideredoneofthebestteachersinth
[originaltext]JaimeEscalantewasconsideredoneofthebestteachersinth
[originaltext]JaimeEscalantewasconsideredoneofthebestteachersinth
[originaltext]ItseemstomethatneighborsaregoingoutofstyleinAmeri
[originaltext]W:Withusnow,isMalcolmBricklin,CEOofVisionaryVehicles.M
[originaltext]W:Withusnow,isMalcolmBricklin,CEOofVisionaryVehicles.M
[originaltext]M:Hi,Susan.Wherewereyouatlunchtime?Iwassavingaseatfo
[originaltext]M:Hi,Susan.Wherewereyouatlunchtime?Iwassavingaseatfo
[originaltext]M:It’sniceandquiethere,awayfromthedustandnoiseofthe
[originaltext]M:It’sniceandquiethere,awayfromthedustandnoiseofthe
随机试题
Americansareproudoftheirvarietyandindividuality,yettheyloveandre
Itis【C1】______spring,andallofusarethankfultoseetreesbloominga
案例:某工地工人在拆现浇楼板钢模时,审批手续还未办好,由于面积大,一时拆不完,中
对CD和CD分子的主要功能是辅助TCR识别抗原并参与T细胞活化信号的转导。CD和CD分子又称T细胞的辅助受体。
下列不属于有效合同的特点的是()。A.签订合同的当事人应当具有相应民事权利能
根据港工规范,载荷试验时,当总沉降量超过承压板直径或宽度的1/15时,可以终止试
下列关于股票期权交易的说法,正确的有( ) Ⅰ做市商是指经证券交易所认可,为
急性肝炎时,LD同工酶的特点是A.LD↑ B.LD↑ C.LD↑ D.LD
引发该求助者心理问题的现实刺激是( )。A.未评上职称 B.不参加同学聚会
用成本计算估价法计算国产非标准设备原价时,利润的计算基数不包括()。A.材
最新回复
(
0
)