首页
登录
职称英语
[originaltext] Today I want to discuss fossil fuels such as coat, oil, and n
[originaltext] Today I want to discuss fossil fuels such as coat, oil, and n
游客
2023-08-21
74
管理
问题
Today I want to discuss fossil fuels such as coat, oil, and natural gas. The term "fossil fuel" refers to the trapped remains of plants and animals in sedimentary rock. You see, living plants trap energy from the sun by the process of photosynthesis, and they store the erergy in their chemical compounds. Most of that energy is released when the plant dies and decays. However, sometimes organic matter is buried before it decays completely. In this way some of the solar energy becomes trapped in rocks— hence the name fossil fuel. Although the amount of organic matter trapped in any one growing season is snail, the accumulated remains from millions of years are considerable. Because the accumulation rate is so slow—millions of times slower than the rate at which we now dig uo this organic matter and burn it for energy—we must consider fossil fuels as nonrenewable resources. Tomorrow we’ll be discussing alternatives to fossil fuels that can be renewed.
1. What is the main topic of this talk?
2. What does the speaker say about the accumulation of fossil fuels?
3. Why does the speaker refer to fossil fuels as nonrenewable?
选项
A、They are no longer produced.
B、They are used up faster than they are created.
C、The growing season of their source has become shorter.
D、Many of their sources have become extinct.
答案
B
解析
这道题是紧承上一题而来的,正是由于矿物燃料的形成时间太漫长,而人们使用的速度超过了它们可以形成的速度(the accumulation rate is…slower than therate at which we dig up organic matter),人们把它视为是不可更新的,因此选B。
转载请注明原文地址:https://tihaiku.com/zcyy/2944369.html
相关试题推荐
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen
[originaltext]Ma.jestic,serene.Justtwowordstodescribethescenicregi
[originaltext]Ma.jestic,serene.Justtwowordstodescribethescenicregi
[originaltext]Thewintergift-givingseasonisresponsiblefortwentyperce
[originaltext]W:Sam,couldyoureviewtheresultsofthesurveyonleisurespor
[originaltext]W:Hey,Mike!DidyouattendMr.Johnson’sseminarontheHistoryof
[originaltext]M:Hello,Mary.ThisisPeteratthehospital.IsMichaelhome?W:
[originaltext]M:Hello,Mary.ThisisPeteratthehospital.IsMichaelhome?W:
随机试题
Whatistheproblem?[br][originaltext]MBMyphonehasn’tbeenworkingthisen
Manyprivateinstitutionsofhighereducationaroundthecountryareindang
Answerthequestionsbelow.ChooseNOMORETHANTHREEWORDSAND/ORANUMBERfrom
甲厂自1995年起在其生产的炊具上使用“红辣椒”商标,并于1997年8月向商标局
某公司从甲地向丁地运送物资,运送过程中先后需要经过乙、丙两个中转站,其中乙中转站
使用具有氧化作用的药物儿童药动学改变的对应描述分别为:A.引起某些药物作用或毒性
女,27岁。正常产后2天,体温37.8℃,乳房胀满疼痛,无红肿、硬结,下列处理正
与横道图相比,网络图不具有的特点是()。A.能清楚地表达工作之间相互联系、相互制
五行中某“一行”对被克的“一行”克制太过,从而引起一系列的异常相克反应,是指A.
我国《合同法》第74条规定,当债务人实施有害债权人的行为时,债权人可行使撤销权。
最新回复
(
0
)