2. 外语
  3. An introductory sentence for a brief summary of the passage is given below. Complete the summary by adding the THREE answer choi

An introductory sentence for a brief summary of the passage is given below. Complete the summary by adding the THREE answer choi

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问题 An introductory sentence for a brief summary of the passage is given below. Complete the summary by adding the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not given in the passage or are minor ideas in the passage. This question is worth 2 points.
    A series of reefs composed of small animals called coral, the Great Barrier Reef is extremely old and extremely big.
    ____________
    ____________
    ____________
    Answer Choices
    1. There are many types of coral, several hundred of which exist as part of the Reef, making it one of the most ecologically diverse places on Earth.
    2. The Reef is a scientific treasure valued both for what it can contribute to our theoretical understanding of ocean ecology and for what it can yield in terms of compounds used for creating new medicines.
    3. Despite efforts to protect large areas of the Reef, the Reef is still threatened by overfishing, shipping accidents, and oil spills.
    4. The tourist industry also poses a threat to the Reef, since groups of divers visit it on boats that can cause just as much damage to the coral as shipping vessels if they hit it.
    5. The most recent threat to the Reef comes from global warming, since the rising temperature of the ocean water disrupts the coral’s symbiotic relationship with a type of algae, causing the coral to turn white and die.
    6. Coral is quite colorful, coming in an array of reds and blues, all generated and maintained by the presence of different varieties of zooxanthellae within the coral.
选项
答案2，3，5
解析 文意总结题 这是一道根据文章判断归纳内容是否正确的题目。让我们来依次看一下答案：
    1．第二段中出现了有关珊瑚种类的很多内容，这是细节问题，并非这篇文章的核心。
    2．第二段结尾部分有所阐述，概括了大堡礁的重要作用，因此是核心内容。
    3．整理概括了第三段中对珊瑚构成威胁的几个危险因素，因此也是核心内容。
    4．是文章根本没有提到的内容。
    5．第四段阐述了水温上升对海藻类相互共生关系产生的影响，是正确的概括。
    6．为了说明珊瑚白化现象，文章才提到了黄绿共生藻类。因此内容较片面，不适合作为对核心内容的概括。
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