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
42
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.
We can learn from the first paragraph that ______.
选项
A、Mauna Loa Observatory is located in northern Canada
B、about 4 million years ago, jungles covered northern part of the Earth
C、the carbon-dioxide concentration is expected to exceed 400 ppm in the next few days
D、it is the first time in human history that carbon-dioxide concentration reaches 400 ppm
答案
C
解析
根据选项A中的“Mauna Loa”定位到首句:...the Mauna Loa Observatory in Hawaii…说明Mauna Loa是在夏威夷而不是加拿大。根据选项B定位到尾句:...4m years ago, when jungles covered northern Canada. 故B项错误。C项对应原文:...researchers at the observatory expect this figure, too, to exceed 400 in the next few days. 而“this figure”指代的就是“carbon-dioxide concentration”,故正确。D项对应原文:The last time such values prevailed on Earth was in the Pliocene epoch 4m years ago… 说明达到400 ppm这个数据不是历史上第一次。综上所述,该题答案为选项C。
转载请注明原文地址:https://kaotiyun.com/show/yNBZ777K
0
考研英语一
相关试题推荐
OnTVDatingShowsA.OnTVDatingShowsB.Wordlimit:160~200words(notincludingthegivenopeningsentence)C.
BytheendoftheMiddleAgesthetechnologicalsystemscalledcitieshadlongsincebecomeacentralfeatureofWesternlife.I
Withincreasingprosperity,WesternEuropeanyouthishavingaflingthatiscreatingdistinctiveconsumerandculturalpatterns
"Itcouldhavebeenworse"wasthecommonrefrainasAmericanbanksbeganreportingtheirsecond-quarterearnings.Indeed,thes
Inthedaysbeforepreschoolacademieswereallbutmandatoryforkidsunder5,IstayedhomeandgotmyearlyeducationfromMi
GivetheSenatesomecredit:inshapingthecurrentimmigration-reformbill,ithascomeupwithoneideathatalmosteverybody
Manisbornfreebutiseverywhereindebt.Intherichworld,gettingholdofyourfirstcreditcardisariteofpassagefarm
Atthemoment,therearetworeliablewaystomakeelectricityfromsunlight.【F1】Youcanuseapanelofsolarcellstocreateth
BeCarefulWhenUsingCreditCards!Studythedrawingcarefullyandwriteanessayof160-200words.Youshould1)descr
WhatIstheElectricityUsedfor?A.Studythechartcarefullyandwriteanessayof160-200words.B.Youressayshould
随机试题
下列关于食管位置及狭窄的叙述,正确的为()
诊断丝虫病,最适宜的采血时间为
中性粒细胞减低症血中性粒细胞的绝对值应小于
断面不分防渗体和坝壳,基本上由均一的黏性土料(壤土、砂壤土)筑成的坝是()。
在土方填筑时,常以土的()来控制土的夯实标准。
凡经国家批准有进口经营权的企业和具有法人资格的承接进口料件加工产品复出口的生产企业(包括外商投资企业),均可向企业所在地海关申请建立保税工厂。()
某企业于2012年3月31日发行了3年期、到期一次还本付息的公司债券。则该企业编制2014年12月31日的资产负债表时,与上述公司债券有关的“应付债券”科目期末余额。应在资产负债表“应付债券”项目中反映。()
()是无上层装置的托盘。
甲要出售自己拥有的一栋商品房。乙得知此消息后,与甲联系,双方谈妥了条件后以100万成交,并进行了过户登记。就在登记后第二天,丙也联系了甲,希望以120万的价格买下此楼。出于价格的诱惑,甲又将楼卖与丙。则下列说法中正确的是()。
首因效应的存在表明下列哪方面很重要,个体对后续信息的解释往往是以其为根据来完成的?()
最新回复
(
0
)