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
考研
At noon on May 4th the carbon-dioxide concentration in the atmosphere around the Mauna Loa Observatory in Hawaii hit 400 parts p
At noon on May 4th the carbon-dioxide concentration in the atmosphere around the Mauna Loa Observatory in Hawaii hit 400 parts p
admin
2018-03-01
43
问题
At noon on May 4th the carbon-dioxide concentration in the atmosphere around the Mauna Loa Observatory in Hawaii hit 400 parts per million (ppm). The average for the day was 399.73 and researchers at the observatory expect this figure, too, to exceed 400 in the next few days. The last time such values prevailed on Earth was in the Pliocene epoch (上新世) 4m years ago, when jungles covered northern Canada.
There have already been a few readings above 400 ppm elsewhere—those taken over the Arctic Ocean in May 2012, for example—but they were exceptional. Mauna Loa is the benchmark (标准) for CO2 measurement because Hawaii is so far from large concentrations of humanity. The Arctic, by contrast, gets a lot of polluted air from Europe and North America.
The concentration of CO2 peaks in May, falls until October as plant growth in the northern hemisphere’s summer absorbs the gas, and then goes up again during winter and spring. This year the average reading for the whole month will probably also reach 400 ppm, according to Pieter Tans, who is in charge of monitoring at Mauna Loa, and the seasonally adjusted annual figure will reach 400 ppm in the spring of 2014 or 2015.
Mauna Loa’s readings are one of the world’s longest-running measurement series. The first, made in March 1958, was 315 ppm. That means they have risen by a quarter in 55 years. In the early 1960s they were going up by 0.7 ppm a year. The rate of increase is now 2.1 ppm—three times as fast—reflecting the relentless rise in green-house-gas emissions.
As a rule of thumb, CO2 concentrations will have to be restricted to about 450 ppm if global warming is to be kept below 2 degrees. Because CO2 stays in the atmosphere for decades, artificial emissions of the gas would have to be cut immediately, and then fall to zero by 2075, in order to achieve 450 ppm. There seems no chance of that. Emissions are still going up. At current rates, the Mauna Loa reading will rise above 450 ppm in 2037.
Which is true according to the last paragraph?
选项
A、CO2 remains in the atmosphere for several dozen years.
B、At current rates, Mauna Loa reading will rise above 450 ppm by 2075.
C、The chance of cutting emissions and achieving 450 ppm by 2075 is good.
D、Human’s gas emissions have been cut at once in order to achieve 450 ppm.
答案
A
解析
A项对应原文:Because CO2 stays in the atmosphere for decades... 其中“stays”=“remains”:“decades”=“several dozen years”,故选项A正确。B项对应原文:At current rates, the Mauna Loa reading will rise above 450 ppm in 2037. 原文提到的是2037年,而非2075年,故选项B错误。C项对应原文:...artificial emissions of the gas would have to be cut immediately, and then fall to zero by 2075, in order to achieve 450 ppm. There seems no chance of that. 原文说的是“no chance”,该选项说的是“the chance…is good”,故错误。D项也对应以上原文。原文说的是“have to be cut”,而不是“have been cut”,故选项D错误。答案为选项A。
转载请注明原文地址:https://kaotiyun.com/show/VNBZ777K
0
考研英语一
相关试题推荐
BytheendoftheMiddleAgesthetechnologicalsystemscalledcitieshadlongsincebecomeacentralfeatureofWesternlife.I
Withhertinywaist,stickthinlegsandpetiteframe,theBarbiedollhasbeenaccusedofpromotinganunhealthybodyimagefor
Inthedaysbeforepreschoolacademieswereallbutmandatoryforkidsunder5,IstayedhomeandgotmyearlyeducationfromMi
Afterclashesbetweenriotpoliceandprotesters,workersattheKeihinHotelinTokyowereforciblyejectedonJanuary25th.Th
Fordecades,ferryboatscrossedthecoldwatersofMichigan’sStraitsofMackinac,shuttlingpeopleandvehiclesbetweenthetw
WhataccountsfortheastoundingpopularityofDr.PhilMcGraw?WhyhavesomanyTVviewersandbookbuyersembracedthistough
TheEconomistcalculatesthataroundtheworldalmost290million15-to24-year-oldsareneitherworkingnorstudying:almosta
TheEconomistcalculatesthataroundtheworldalmost290million15-to24-year-oldsareneitherworkingnorstudying:almosta
TheEconomistcalculatesthataroundtheworldalmost290million15-to24-year-oldsareneitherworkingnorstudying:almosta
随机试题
TherelationshipbetweenlanguagelearningstrategypreferencesandEnglishproficiencyamongstudentspuzzlesmanyEnglishlea
根据中华人民共和国国家卫生标准,营养强化剂加入剂量一般以膳食营养素推荐摄入量的()为宜。
鉴别苷的常用反应是
新奥法施工变形观测中,以下叙述正确的有()。
工程设计有重大修改的,项目法人(建设单位)报()批准。
火灾风险评估常用的试验方法有()。
“未老先衰”暗喻了老年人四种年龄之间的关系是()。
一套试卷有若干道题,每题答对得10分,答错扣5分,不答扣3分。小郑答对、答错、不答的题目数量依次成等差数列,最后总分为95分,问这套试卷共有多少道题?
某种流感在流行。从人群中任意找出3人,其中至少有1人患该种流感的概率为0.271。(1)该流感的发病率为0.3。(2)该流感的发病率为0.1。
产生软件维护的副作用是指______ 。
最新回复
(
0
)