雅思阅读时间的分配

雅思阅读考试(A类)，一共一个小时，三篇文章，每篇文章13或14题目。如果按照时间进行分配，即：20分钟要完成一篇文章和14道题的任务，主要看你自己对阅读内容熟不熟悉，如果是比较常见的话题可以快一些，对不熟悉的可以多花几分钟。



拓展资料
1. 雅思考试（IELTS），全称国际英语语言测试系统，外文名International English Language Testing System，由剑桥大学考试委员会外语考试部、英国文化协会及IDP教育集团共同管理，是一种针对英语能力，为打算到使用英语的国家学习、工作或定居的人们设置的英语水平考试；
2. 雅思考试分学术类和培训类两种，分别针对申请留学的学生和计划在英语语言国家参加工作或移民的人士。考试分听、说、读、写四个部分，总分9分；
3. 雅思考试已获得全球135个国家逾9000所教育机构、雇主单位、专业协会和政府部门的认可；
4. 雅思考试作为全球留学及移民类英语测评的领导者，每年有超过200万人次的考生参加雅思考试。

雅思阅读 the deep sea

Deep-sea vents　Ocean-floor migration
　　How surface winds blow deep-sea critters from vent to vent

　　EVER since their discovery in the 1970s, deep-sea vents—chimney-like structures on the ocean floor that belch hot water and dissolved minerals into the surrounding ocean—have been one of the hottest topics in marine biology. The vents support populations of bacteria, giant worms, clams, shrimp and other creatures in the inky darkness, often several kilometres below the surface. Unlike virtually every other ecosystem on the planet, these deep-sea communities do not rely on the sun for their food. Instead of using photosynthesis, the bacteria at the bottom of the food chain harvest energy from chemicals supplied by the vents themselves.
　　The vents are both widely spaced and transient, which means their denizens live a precarious existence. Yet travel between vent systems is apparently possible, even across miles of desolate ocean floor. Creatures confined to islands rapidly head in a different genetic direction to mainland relatives; but researchers have found surprisingly little genetic variation between the populations of even quite widely spaced ocean-bottom vents. Last year one paper described how a vent system that had been wiped clean by a volcanic eruption was quickly recolonised by a variety of larval creatures, some of which seemed to have travelled from another vent more than 300km (190 miles) away. Exactly how has remained a mystery.
　　Now a group of scientists led by Lauren Mullineaux at America’s Woods Hole Oceanographic Institution has described in Science how such transfers could happen—and, in the process, discovered something surprising about how surface weather influences the deep ocean, traditionally thought of as an isolated, closed world.
　　The group was monitoring vents more than 2km beneath the surface in the Pacific Ocean off the coast of Central America when it found that quantities of larva and certain chemicals being emitted both fell sharply during periods of unusually strong deep-sea currents. This is consistent with larva and effluent from the vents being swept away into the open ocean. As a colonisation strategy, dispersal by ocean current would be unreliable—with vent systems so scarce, most of the larva swept out to sea would presumably perish—but plenty of plants on land adopt a similar approach using the wind.
　　The research offers more than just an insight into the life cycle of subsea gribblies. The powerful deep currents were strongly correlated with the passage of wind-generated mesoscale eddies: swirls of water tens or even hundreds of kilometres across on the ocean surface. The idea that surface winds can influence deep-sea currents is surprising, and it suggests that the atmosphere’s influence may extend far deeper into the oceans than previously thought. The researchers found that the surface eddies—and presumably, the deep currents as well—tended to form between autumn and spring, and were more common during El Nio years. Even in the frigid darkness of the deep ocean it seems there may be weather and seasons of a sort.
　　以上就是这篇关于deep-sea的小动物的雅思阅读材料，是一篇科普类的文章，难度并不是很大，除了一些专有名词和专业词汇之外。大家可以在自己的雅思阅读备考中多多阅读这类的文章，对于词汇的积累和文章阅读速度的提高都有好处。