A、The effects of hot weather on animals. B、How animals survive in extreme temperatures. C、How changes in location affected dinos

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问题  
Before I tell you about the interesting discovery related to Tyrannosaurus rex, I need to review something we studied last semester—the difference between what are commonly called cold-blooded and warm-blooded animals. In warm-blooded animals, birds and mammals, for example, the body temperature normally stays within a narrow range, no matter what the outside temperature is. As a result, a warm-blooded animal is usually active in both cold and hot weather because its body temperature can adjust to the temperature of its environment.
    On the other hand, cold-blooded animals, such as most reptiles, amphibians, and insects, are unable to create enough heat internally to raise their temperature above the temperature of the environment. So, for example, the temperature of a cold-blooded animal falls when the environment is cool.
    I hope this distinction is clear. Now, moving on to Tyrannosaurus rex, you may know that dinosaurs, being reptiles, are generally believed to have been cold-blooded. Well, a recent research study found that the chemical composition of the bones of Tyrannosaurus rex was consistent with the bones of an animal that has a very narrow range of internal temperature, indication that it was probably warm-blooded.
6. What is the main topic of the lecture?
7. What is likely to happen to cold-blooded animals when the weather is cold?
8. Why does the speaker discuss Tyrannosaurus rex?

选项 A、The effects of hot weather on animals.
B、How animals survive in extreme temperatures.
C、How changes in location affected dinosaurs.
D、The differences between warm-and cold-blooded animals.

答案D

解析 这道题具有一定的迷惑性,因为四个选项里都包含这段课堂教学讲话里出现过的单词。在这种情况下,首先要确定各个选项的中心词。四个选项的中心词依次是:effects,survive in extreme temperatures,changes in location,differences. 这样就比较容易排除“炎热天气对动物的影响”、“动物怎样在极端气温下生存”和“地点变化对恐龙的影响”,从而判断出听力材料的主题是选项D(冷血动物与热血动物的区别)。Tyrannosaurus rex:暴龙。
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