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　　1.单选题

　　[概括大意]Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals， but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise， the older the massive volcanic eruptions were， the more damage they seemed to do.

　　The main idea of this paragraph is__________.

　　A、Association of Mass Extinctions with Volcanic Eruptions

　　B、Killing Power of Ancient Volcanic Eruptopms

　　C、A Mass Extinctions

　　D、Volcanic Eruptions That Caused No Mass Extinction

　　正确答案：A

　　答案解析：本段文字的第一句话：Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.里兹大学的Paul Wignall正在研究火山爆发与物种大量灭绝的联系。The association of mass extinctions with volcanic Eruptions与the link between volcanic eruptions and mass extinctions在意思上是相同的。答案是A。

　　2.单选题

　　【概括大意】A good rule of thumb(好的做法)is to take your body weight in pounds and divide that number in half. That gives you the number of ounces(盎司)of water per day that you need. For example, if you weigh 160 pounds, you should drink at least 80 ounces of water per day. If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active. If you drink coffee or alcohol, you should add at least an equal amount of water. When you are traveling on an airplane, it is good to have 8 ounces of water for every hour you are on board the plane.

　　Q:The main idea of this paragraph is__________.

　　A、Ounces of Water Needed Per Day

　　B、A Good Rule of Thumb

　　C、Different People Drink Different Ounces of Water

　　D、How to Drink Water

　　正确答案：A

　　答案解析：通过本段第二句及后边的例证可以看出本段主要讲的是每天需要的水量。

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