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　　1.單選題

　　[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

　　正確答案：A

　　答案解析：本段文字的第一句話(huà)：Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.里茲大學(xué)的Paul Wignall正在研究火山爆發(fā)與物種大量滅絕的聯(lián)系。The association of mass extinctions with volcanic Eruptions與the link between volcanic eruptions and mass extinctions在意思上是相同的。答案是A。

　　2.單選題

　　【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

　　正確答案：A

　　答案解析：通過(guò)本段第二句及后邊的例證可以看出本段主要講的是每天需要的水量。

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