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2017年8月19日雅思阅读机经及答案
2017-08-27 16:02:18   来源:   评论:0 点击:

  文章导读:2017年8月19日雅思阅读机经及答案,100留学教育小编为正在备考的烤鸭们准备整理,希望通过雅思真题历练,你能掌握解题思路及答题技巧。

  雅思机经,就是雅思考试题目回忆记录。希望同学们借助雅思机经,总结出雅思出题经验,从而顺利通过雅思考试。

  >>>ielts试题:2017年8月19日雅思机经及答案  

  一、 考试概述:

  本次考试的文章三篇均为旧题,三篇主题分别是关于水獭、过山车和音乐的,文章难度都不大。不过本次考试题型考查很全面,难度较大的配对题及主旨大意题居多,以往考查较多的判断题这次出题量却很少。这就需要大家备考时注重每种题型的练习,以应对考场上可能出现的各种情况。

  二、具体题目分析

  Passage 1:

  题目:Otters

  题型:段落细节配对 6 +简答题 4

  新旧程度:旧题

  文章大意:介绍水獭

  参考文章:

  Otters

  A)Otters are semiaquatic (or in the case of the sea otter, aquatic) mammals. They are members of the Mustelid family which includes badgers, polecats, martens, weasels, stoats and minks, and have inhabited the earth for the last 30 million years and over the years have undergone subtle changes to the carnivore bodies to exploit the rich aquatic environment. Otters have long thin body and short legs-ideal for pushing dense undergrowth or hunting in tunnels. An adult male may be up to 4 feet long and 30 pounds. Females are smaller, around 16 pounds typically. The Eurasian otter nose is about the smallest among the otter species and has a characteristic shape described as a shallow "W". An otter's tail (or rudder, or stern) is stout at the base and tapers towards the tip where it flattens. This forms part of the propulsion unit when swimming fast under water. Otter fur consists of two types of hair: stout guard hairs which form a waterproof outer covering, and under fur which is dense and fine,equivalent to an otter's thermal underwear. The fur must he kept in good condition by grooming. Sea water reduces the waterproofing and insulating qualities of otter fur when salt water gets in the fur. This is why freshwater pools are important to otters living on the coast. After swimming, they wash the salts off in the pools and then squirm on the ground to rub dry against vegetation.

  B) Scent is used for hunting on land, for communication and for detecting danger. Otterine sense of smell is likely to similar in sensitivity to dogs. Otters have small eyes and arc probably short-sighted on land. Bui they do have the ability to modify the shape of the lens in the eye to make it more spherical, and hence overcome the refraction of water. In clear water and good light, otters can hunt fish by sight. The otter's eyes and nostrils are placed high on its head so that it can see and breathe oven when the rest of die body is submerged. The long whiskers growing around the muzzle are used to detect the presence of fish. They detect regular vibrations cruised by the beat of the fish's tail as it swims away. This allows otters to hunt even in very murky water. Underwater, the otter holds its legs against the body, except for steering, and the hind end of the body is flexed in a series of vertical undulations. River otters have webbing which extends for much of the length of each digit, though not lo the very end. Giant otters and sea otters have even more prominent webs, while the Asian short-clawed otter has no webbing-they hunt for shrimps in ditches and paddy fields so they need the swimming speed. Otter ears are protected by valves which close them against water pressure.

  C) A number of constraints and preferences limit suitable habitats for otters. Water is a must and the rivers must be large enough to support a healthy population of fish. Being such shy and wary creatures. they will prefer territories where man's activities do not impinge greatly. Of course, there must also be no other otter already in residence-this has only become significant again recently as populations start to recover. A typical range for a mule river otter might he 25km of river, a female's range loss than half this. However, the productivity of the river affects his hugely and one study found male ranges between 12 and 80km. Coastal otters have a much more abundant food supply and ranges for males and females may be just a few kilometers of coastline. Because male ranges are usually larger, a male otter may find his range overlaps with two or three females. Otters will eat anything that they can get hold of there are records of sparrows and snakes and slugs gobbled. Apart from fish the most common prey are crayfish, crabs and water birds. Small mammals are occasionally taken, most commonly rabbits but sometimes even moles.

  D) Eurasian otters will breed any time where food is readily available. In places where condition is more severe, Sweden for example where the lakes are frozen for much of winter, cubs arc born in Spring. This ensures that they are well grown before severe weather returns. In the Shetlands. cubs are bam in summer when fish is more abundant. Though otters can breed every year, some do not. Again, this depends on food availability. Other factors such as food range and quality of the female may have an effect. Gestation for Eurasian otter is 63 days, with the exception of North American river otter whose embryos may undergo delayed implantation.

  E) Otters normally give birth in more secure dens to avoid disturbances. Nests are lined with bedding (reeds, waterside plants, grass) to keep the cubs warm while mummy is away feeding. Litter Size varies between 1 and 5 (2 or 3 being the most common). For some unknown reason, costal otters lend to produce smaller litters. At five weeks they open their eyes-a tiny cub of 700g. At seven weeks they're weaned onto solid food. At five weeks they leave the nest, blinking into daylight for the first time. After three months they finally meet the water and learn to swim. After eight months they are hunting, though the mother still provides a lot of food herself. Finally, after nine months she can chase them all away with a clear conscience, and relax-until the next fella shows up.

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