雅思阅读真题+题目+答案：water hyacinth: beautiful yet destructive

雅思阅读真题+题目+答案：water hyacinth: beautiful yet destructive

雅思阅读真题原文如下：

A. Despite possessing vibrant purple flowers and being attractive to the eye, the water hyacinth has often been referred to as the most problematic aquatic plant in the world’s waters. Due to its aesthetic appeal, water hyacinth, which is native to South America, has been distributed to many different regions and now thrives in the southern states of the USA and many subtropical and tropical locations. It has also been observed to be relatively tolerant of cooler climates and is routinely sold as an ornamental plant for domestic use in a number of horticulture centres.

B. Though the hyacinth species is distinctive in appearance, another aquatic floating plant – water lettuce – is sometimes mistakenly identified as water hyacinth. Water lettuce, however, does not have the same attractive flowers, has larger leaves and is less tolerant of cooler climates. Water hyacinth has rounded waxy, green leaves which grow up to around 6 inches in width and floating leaf stems which grow up to 12 inches in length. Flowers are typically between 2 to 3 inches in width and as many as 15 flowers, each purple on the outside and containing a yellow centre, may grow from each plant.

C. Many of the problems associated with the water hyacinth are due to its incredible growth and reproduction capabilities, which have made it difficult to control and allow it to quickly dominate the environment in which it grows and spreads. Its growth patterns are characterised by a rapid formation of an impenetrable vegetation mass; botanists say that one plant can produce around 5000 seeds and in one study two plants were observed to produce 1200 plants in as little as 4 months. Following nature’s usual pattern, water hyacinth seeds are distributed outside of the immediate area by birds, fauna, wind and water currents, facilitating growth in surrounding areas previously free of the plant.

D. Domination of environments by water hyacinth populations has a number of negative implications. For humans, difficulties may be faced in getting boats through areas of rivers and lakes where the plant is present and fishing and swimming opportunities may be limited. However, the implications for the ecosystem of the immediate environment may be of even greater concern. The density of the mass of water hyacinth populations can prevent adequate amounts of sunlight and oxygen reaching the water: as a result, significant numbers of fish may die, other species of plant growing below water level are compromised and the ecosystem of the immediate area can therefore become unbalanced. Furthermore, the conditions created by the presence of water hyacinth, while detrimental to most forms of life, are perfect for encouraging growth of deadly bacteria often found in poorly oxygenated areas of water.

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Questions 14-18

Reading Passage 2 has eight sections A-H.

Which paragraph contains the following information?

Write the correct answer A-H in boxes 14-18 on your answer sheet.

14  Why the use of bio-control insects may be less successful than the first time.

15  The implications of reducing commitment to control of plant populations.

16  The problems water hyacinth causes other species of plants and animals.

17  How human activity has contributed to the problem

18  Reasons water hyacinth is found in many parts of the world

Questions 19-23

Classify the following features as characteristics of

A  Water hyacinth

B  Water lettuce

C  Both water hyacinth and water lettuce

D  Neither water hyacinth or water lettuce

Write the correct letter A, B, C or D in boxes 19-23 on your answer sheet.

19  has aesthetically pleasing purple flowers.

20  does not thrive well in colder temperatures.

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