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
2023-08-28
41
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] By saying that "We’ve seen high levels of plastic in the Arctic", Simon Boxall thinks that ______.
选项
A、Lavender has overestimated the rate of degradation of plastic
B、there is more plastic in the ocean than Lavender’s estimate
C、it is possible for the plastic to be pushed out of the gyre
D、there is more plastic in the Arctic than that in the gyre
答案
C
解析
Lavender认为海洋的水流不太可能将塑料冲出环流,但Simon Boxall并不同意这个观点。因而他说出了题干中的那番话“我们在北极就看到很多塑料”,目的是为了反驳Lavender。由此可见,Simon Boxall应认为塑料有可能被冲出环流并被冲到别的海域去。C与其观点最为相近,为本题答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2964157.html
相关试题推荐
____________________________,sowemustcontroltheamountofexercisewedo.
Currentstudiesdonotsupportthehypothesisthatmultiplevaccines____________
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
随机试题
[originaltext]IworkinadvertisingandIliketokeepupwithcurrenttrends,
[originaltext]M:Hi,Claire.Howdoesitfeeltobebackoncampus?W:Gee,Hi,
下列人物属于战国四君子的是()A.冯谖 B.孟子 C.庄子 D.孟尝君
DW的数据具有若干基本特征,下列不正确的是()A.面向主题的 B.集成的
项目管理计划的内容不包括()A.成本绩效 B.沟通管理计划 C.进度管理计
应以标准养护()龄期的试件为准评定水泥混凝土弯拉强度。A.3d B.7d C
根据《房屋建筑与装饰工程工程量计算规范》(GB50854-2013),关于金属
先天性甲状腺功能减低症患儿应用药物治疗症状好转后,最应注意的问题是(
下列可以免征进口关税和进口环节增值税、消费税的特定减免税货物的是()。 A
在行政诉讼中,原告向两个以上有管辖权的人民法院提起诉讼的,应当由()。A.
最新回复
(
0
)