TPO66阅读原文+题目+答案下载：What is Coral?

TPO66官方已经发布有一段时间了，小编这就和大家分享。目前本篇文章为TPO66阅读真题的第3篇阅读真题，前两篇为：

TPO66阅读原文+题目+答案下载：The Actor and the Audience

TPO66阅读原文+题目+答案下载：Visions of the Land

第三篇文章为下.

TPO66阅读原文+题目+答案下载：What is Coral?

Corals belong to a group of animals called cnidarians. This group encompasses hard and soft corals., sea fans, gorgonians, hydroids, jellyfish, and sea anemones Although the group is remarkably diverse, there are a few features shared by all. They have a free-swim mi ng larval stage and a simple body plan: a central mouth, through which material passes in and out of the body, and a ring of tentacles. The other distinguishing feature of the cnidarians is the presence of nematocysts (stinging cells), which are used to catch prey.

1. (单选题) According to paragraph 1, which of the following is true about the group of animals called cnidarians? Incorrect choices change the meaning in important ways or leave out essential information

A. Its members are remarkably similar in appearance.

B. They are unable to catch their own food.

C. They can swim in their earliest stages of life.

D. They have highly complex bodies

Individual corals are known as coral polyps: each is a single animal. 【A】In isolation a coral polyp looks very similar to a sea anemone, but unlike sea anemones, which live separated from each other, corals form colonies. 【B】A few species remain solitary, but in most cases, new polyps bud off the initial founding polyp, and gradually colonies of thousands or even millions of polyps will grow, each connected to its neighbors by living tissue.【C】Freed from the limitations of living alone, colonies can grow to immense sizes and live a very long time.【D】

2. (单选题) According to paragraph 2, what do corals and sea anemones have in common?

A. The individuals of both species resemble each other

B. They both form large colonies

C. The individuals of both species are called polyps

D. They both live very long lives

Corals come in all shapes and sizes, but the basic plan is the same, polyps live as a surface layer on some sort of structure, be it hard and inflexible or rubbery. The hard, or true corals, for which reefs are most famous, build limestone skeletons beneath the living tissue. Soft corals, as their name implies, do not form solid skeletons; instead they secrete limestone crystal structures called sclerites, which are embedded within a jellylike matrix beneath the polyps.When they die, little is left of most soft corals as the limestone element of their makeup is so small and easily breaks up.

3. (单选题) Which of the following can be inferred about coral reefs from paragraph 3?

A. They are only found on hard structures

B. The most famous ones are supported by solid skeletons

C. They require sclerites to live

D. The jellylike matrix within them contains no limestone
 

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