首页
登录
职称英语
Half of the world’ s coral reefs (珊瑚礁) have died in the last 30 years. Now s
Half of the world’ s coral reefs (珊瑚礁) have died in the last 30 years. Now s
游客
2024-01-16
49
管理
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 warming 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.
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. [br] According to the passage, ______ is the biggest threat to coral reefs.
选项
A、pollution
B、overfishing
C、industrial activity
D、climate change
答案
D
解析
定位到文章第五段第一句“Although reefs face other threats from pollution,industrial activities,and overfishing,it is global climate change that most concerns scientists.”可知,尽管珊瑚礁面临着来自污染、工业生产和过度捕捞的其他威胁,但最让科学家担忧的是全球气候变化。所以科学家认为珊瑚礁面临的最大威胁来自于气候变化。故选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3366717.html
相关试题推荐
Thenewpowerplantisreported________withinthreeyears.A、havingbeencomplete
Fewpeoplenowadaysareableto______friendshipintotheirsenioryears.A、postpo
Thecompanyhas______heavyfinanciallossesoverthelasttwoyears.A、enduredB、
Bynextyearhe______inNewYorkforfiveyears.A、hasworkedB、hasbeenworking
Halfoftheworld’scoralreefs(珊瑚礁)havediedinthelast30years.Nows
Halfoftheworld’scoralreefs(珊瑚礁)havediedinthelast30years.Nows
Halfoftheworld’scoralreefs(珊瑚礁)havediedinthelast30years.Nows
Theplanet’shealthdependsonthesurvivalofcoralreefs.珊瑚礁的生存关乎地球是否处于健康状态。
Halfoftheworld’scoralreefs(珊瑚礁)havediedinthelast30years.Nowsci
Halfoftheworld’scoralreefs(珊瑚礁)havediedinthelast30years.Nowsci
随机试题
Friedfoodshavelongbeenfrownedupon.Nevertheless,theskilletisabout
Themanager,aswellashisadvisers,______toattendtheworldfair.A、areagre
[originaltext]M:I’venevertastedsuchtastysoup.IwishIhadtherecipeandI
按照变革力度和解决问题的彻底程度,可以将组织变革分为()。A.主动性变革
D
上腔静脉造影常做____穿刺插管A.肱动脉 B.肘动脉 C.股静脉 D.贵
一列队伍沿直线匀速前进,某时刻一传令兵从队尾出发,匀速向队首前进传送命令,他到达
肺炎支原体的特点是( )。A.具有细胞壁 B.无致病性 C.主要以无性繁殖
初产妇,经助产分娩一男婴,胎盘娩出后阴道持续出血约800ml。护士采取的正确措施
患者,男,45岁,1年前开始乏力、消瘦,曾检查发现脾大,仅服过中药,未系统检查。
最新回复
(
0
)