2014高考英语阅读理解专题训练极品题（24）及答案
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阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
Sometimes people call each other “scaredy-cat”, but have you ever thought about this expression? When a cat is frightened, its heart starts beating faster, its muscles get tense, and there are changes in the chemicals in its blood-stream.
Although the cat doesn’t realize this, its body is getting ready for action. If the danger continues, this animal will do one of the two things. It will defend itself, or it will run away as fast as it can.
Something like this also happens to people. When we are excited, angry, scared, or aroused by other emotions, our bodies go through many physical changes. Our hearts beat faster, and our muscles get tense. All of these changes make us more alert and ready to react. We, too, get ready to defend ourselves or run.
