首页
登录
职称英语
The amount of floating plastic trapped in a north Atlantic current system ha
The amount of floating plastic trapped in a north Atlantic current system ha
游客
2023-08-15
73
管理
问题
The amount of floating plastic trapped in a north Atlantic current system hasn’t got any bigger in 22 years, despite more and more plastic being thrown away. Since 1986 students taking samples of plankton (浮游生物) in the Atlantic and Caribbean Oceans have also noted when their nets caught plastic litter. Kara Lavender and colleagues at the Sea Education Association in Woods Hole, Massachusetts, analysed the data, and found that of 6136 samples recorded, more than 60 per cent included pieces of plastic, typically just millimetres across. The areas of highest plastic concentration are within the north Atlantic sub-tropical gyre (环流), where currents gather the litter.
Lavender and her team were surprised to find that the amount of floating plastic had not increased in the gyre. Although it has been illegal since the 1970s for ships to throw plastic overboard, Lavender thinks that the overall rate of plastic rubbish reaching the ocean will have increased, given the fivefold increase in global production of plastic since 1976. "Where the extra plastic is going is the big mystery," she says. Plastic resists bio-degradation and can last decades or more in the ocean. Eventually sunlight and wave motion break it into smaller pieces, which can be harmful to marine life—blocking the stomachs of fish and seabirds, for example.
Some experts suggest that the plastic might be degrading into pieces small enough to pass through the 0.3-millimetre-mesh nets used in the study, or becoming coated in biofilms and sinking out of range of the nets. However it is unclear why the rate of degradation during the study period should have increased to offset the extra plastic going into the ocean. Lavender says it is unlikely that ocean currents are pushing plastic out of the gyre, although Simon Boxall of the National Oceanography Centre in Southampton, UK, who wasn’t involved in the study, disagrees. He says the Atlantic gyre has an exit strategy in the form of the Gulf Stream. "We’ve seen high levels of plastic in the Arctic." he says.
Wherever it is going at the moment, the plastic on our oceans will eventually be broken down into microscopic pieces and individual molecules whose environmental effect is unknown. "The million-dollar question is, is it causing any damage?" says Boxall.
"When plastic particles get so small are they just like fibre going through the system? Some studies suggest that persistent chemicals in newer plastics function as endocrine (内分泌) disruptors and simulated hormones." And this fine-grained plastic is very long-lived. "The depressing thing is it’s likely to remain in the oceans essentially forever," says Lavender. [br] Lavender tends to believe that the amount of floating plastic litter is most determined by______.
选项
A、the laws against plastic throwing
B、the overall production of plastic
C、our awareness of the environment
D、the natural conditions in the ocean
答案
B
解析
题目问,在Lavender看来,是什么决定着漂浮塑料垃圾的数量。该段第2句先谈到Lavender认为垃圾总数应该是在增加的,接着用given(考虑到)表明原因,即全球塑料的产量在增加(fivefold increase“增加5倍”)。这与B的内容一致,故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/2927400.html
相关试题推荐
[originaltext][16]Well,mycurrentresearchisreallyaboutconsumerbehav
[originaltext][16]Well,mycurrentresearchisreallyaboutconsumerbehav
[originaltext][16]Well,mycurrentresearchisreallyaboutconsumerbehav
该系统的投入运行使中国成为继美国和俄罗斯之后第三个拥有自己的卫星导航系统的国家。TheoperationofthesystemhasmadeChi
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
[originaltext]Currentstudiesshowthatwhatgoesonlabelsisanimportant
[originaltext]W:[19]Therewillbemoreplasticthanfishintheworld’soceans
TheamountoffloatingplastictrappedinanorthAtlanticcurrentsystemha
随机试题
TheCompetitionamongproducersofpersonalcomputersisessentiallyarace
[originaltext] (1)TheemergencyplanannouncedbytheKenyanCabinetthisweek
预测性新闻就预测的范围大小而言可分为()A.长期预测新闻 B.宏观预测新闻
塔式起重机司机患有下列哪些疾病和生理缺陷的不能做司机工作()A.色盲 B.
根据期货投资者入市目的的不同,可将期货投资者分为()。 Ⅰ.期货套利者
灭菌效果最可靠的物理灭菌法是A.燃烧法 B.煮沸消毒法 C.紫外线照射法
下列有关扁平化管理的说法中不正确的是:A.扁平化管理以工作流程为中心 B.扁平
关于行为事件访谈法,正确的说法有()。 A.是获取胜任特征的主要方法 B.
克罗恩(Crohn)病最常见的并发症是 A.腹腔内脓肿B.吸收不良综合征C.肠
检查序列平稳性的标准方法是单位根检验,常用的检验方法有()。A.DF检验法
最新回复
(
0
)