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
专升本
Half of the world’ s coral reefs(珊瑚礁) have died in the last 30 years. Now scientists are racing to ensure that the rest survive.
Half of the world’ s coral reefs(珊瑚礁) have died in the last 30 years. Now scientists are racing to ensure that the rest survive.
admin
2019-03-28
21
问题
Half of the world’ s coral reefs(珊瑚礁) have died in the last 30 years. Now scientists are racing to ensure that the rest survive. Even if global warning were to stop right now, scientists predict that more than 90% of corals will die by 2050. If no major steps are taken to
address
the problem, the reefs may be headed for total extinction(灭绝).
The planet’ s health depends on the survival of coral reefs. They are often described as " the rainforests of the sea" , because they provide shelter for a wide variety of sea life. In addition, the reefs serve as barriers that protect coastlines from the full force of powerful storms.
Corals are used in medical research for cures to diseases. They are key to local economies as well, since the reefs attract tourists, the fishing industry, and other businesses, bringing in billions of dollars.
Corals are particularly sensitive to changes in temperature. A rise of just 1 to 2 degrees can force the corals to drive out the algae (水藻). Then the corals turn white in a process called "bleaching". Corals can recover from short-term bleaching, but long-term bleaching can cause permanent damage. In 1998, when sea surface temperatures were the highest in recorded history, coral reefs around the world suffered the most severe bleaching. It is estimated that even under the best of conditions, many of these coral reefs will need decades to recover.
Although reefs face other threats from pollution, industrial activities, and overfishing, it is global climate change that most concerns scientists. Scientists remain hopeful that it’ s not too late to save the reefs, and some are moving ahead on experiments to accomplish that goal.
According to the passage,______is the biggest threat to coral reefs.
选项
A、pollution
B、overfishing
C、industrial activities
D、climate change
答案
D
解析
根据第五段第一句“Although reefs face other threats from pollution,industrial activities, and overfishing, it is global climalte change that most concerns scientists.”可知,尽管珊瑚礁面临着环境污染、工业活动以及过度捕捞等威胁,但是全球气候变化依然是科学家们最为担忧的。由此可推知,气候变化是对珊瑚礁最大的威胁。故选D。
转载请注明原文地址:https://kaotiyun.com/show/EIJC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Morethanfortythousandreaderstolduswhattheylookedforinclosefriendships,whattheyexpected【C1】______friends,whatth
Thereareseveralcharacteristicsofthetextbook()attention.
A.Whatwasnotrealizedinthoseearlyyearswasthatbirdshavemusclesverymuchstronger,inproportiontotheirsize,than
A、Femalestudentsareunfitforstudyingphysics.B、Hecanserveasthewoman’stutor.C、Physicsisanimportantcourseatschoo
Iamveryfamiliar______thiscityasIhavebeenlivinghereformorethan10years.
Withoutair,thecandlewill______.
Althoughsomeareassufferedfromseriousnaturaldisasters,thetotalgrainoutputwashigherthanthatoflastyear.
By"somepeople"Imeanme.Whyisitthataneveningstroll(散步)leavesmefeelingeatenalivewhilemycompanionsareleftblis
By"somepeople"Imeanme.Whyisitthataneveningstroll(散步)leavesmefeelingeatenalivewhilemycompanionsareleftbliss
Shesaidthatshewouldbehereatseveno’clock.Butshedidn’t______untileight.
随机试题
儿童对自己的性器官感兴趣的时期是()
女性,19岁。头痛,呕吐1年余,继而出现复视。体检:两眼上视不能,外展受限,角膜反射迟钝。最可能的定位诊断是
A、润肠通便B、活血C、温脾止泻摄唾D、安胎E、补肺气,定喘嗽蛤蚧除助肾阳,益精血外,又能()。
下列剂型中,既可内服又可外用的是()。
甲因生活琐事与乙发生矛盾,就想报复一下乙。一天,甲见乙一个人在街上行走,便从路边捡起一根木棍,乘乙不备,狠狠地向乙的腿部猛打数下。乙当场倒地,抱腿挣扎。甲见乙痛苦难忍,顿生怜悯之心,便迅速将乙送往医院救治。虽经鉴定,乙被打成轻伤,但经医院积极治疗,乙痊愈出
甲是某高校在职研究生,经济上独立于其家庭。2001年6月在工商行政管理机关注册成立一家从事经济咨询的个人独资企业,注册资本为人民币1元。营业头两个月业绩良好,另两家有限责任公司看好该企业,遂与甲协商参与该独资企业的投资经营,投资50万元人民币。经营过程中共
简述侵犯商业秘密罪的具体行为表现。
设f(x)=2x+3x一2,则当x→0时()
某LinuxDHCP服务器dhepd.conf的配置文件如下:ddns-update-stylenone;subnet192.168.0.0netmask255.255.255.0{range192.168.0.200192.168.0.254:i
Thefirstmanwhocookedhisfood,insteadofeatingitraw,livedsolongagothatwehavenoideawhohewasorwherehelived
最新回复
(
0
)