首页
登录
职称英语
[originaltext] Burning fallen leaves used to be standard practice across No
[originaltext] Burning fallen leaves used to be standard practice across No
游客
2023-08-31
17
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.
(30) What’s more, because of the moisture that is usually trapped within leaves, they tend to bum 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.
(31) 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.
选项
A、Burning them completely.
B、Keeping them where they are.
C、Changing them into fertilizer.
D、Using them to cover lawns.
答案
C
解析
文章中提到落叶可以用来做肥料,而且不妨碍生态环境。故本题答案为C 。
转载请注明原文地址:https://tihaiku.com/zcyy/2972995.html
相关试题推荐
[originaltext]EllenTaaffeZwilichisoneoftheclassicalmusiccomposers
[originaltext]Between1815and1915,morethan30millionimmigrantsarrive
[originaltext]W:Areyousurethatwe’llbesafe?M:Takeiteasy.Alltheski
[originaltext]W:Areyousurethatwe’llbesafe?M:Takeiteasy.Alltheski
[originaltext]W:Areyousurethatwe’llbesafe?M:Takeiteasy.Alltheski
[originaltext]M:I’vejustfoundthemostusefuldeviceatthatnewoutdoorsto
[originaltext]M:I’vejustfoundthemostusefuldeviceatthatnewoutdoorsto
[originaltext]ThereisoneforeignproducttheJapanesearebuyingfastert
[originaltext]ThereisoneforeignproducttheJapanesearebuyingfastert
[originaltext]ThereisoneforeignproducttheJapanesearebuyingfastert
随机试题
Sheremainsconfidentand______untroubledbyourpresentproblems.A、indefinite
Theroofhadbeendamagedandwaterwas______fromtheceilingsandweaskedMik
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
Teachersandparentsnormallycallattentiontothepictureswhentheyread
脚手架使用要求,当遇()以上大风、大雪、大雨、大雾天气下应暂停在脚手架上作
(2017年)位于市区的某居民企业为增值税一般纳税人,主要生产销售同一型号的热水
检测机构应当建立档案管理制度。检测合同、委托单、原始记录、检测报告用当按年度统一
某工作A持续时间为5天,最早可能开始时间为3天,该工作有三个紧后工作B、C、D的
阴虚火旺可见A.自汗 B.战汗 C.盗汗 D.大汗 E.绝汗
电压互感器外绝缘严重裂纹、破损,电压互感器有严重放电,已威胁安全运行时应()
最新回复
(
0
)