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导语：以下英语网为大家整理了全面的职称英语考试历年真题及答案解析，《职称英语考试试题汇总：历年真题及答案解析》供大家参考学习。更多职称英语考试试题敬请关注英语网！ 【推荐】关注英语网微信：yingyuwang2013，更快获取真题答案及成绩查询信息。 第4部分：阅读理解(第31-45题，每题3分，共45分) 下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。 第一篇 The Hyper-X The Hyper-X(超音速飞机)recently broke the record for air-breathing jet planes when it traveled at a Hypersonic speed(超音速)of seven times the speed of sound.Thats about 5,000 miles per hour.At this speed，youd get around the world-flying along the equator (赤道)-in less than 5 hours. The Hyper-X is an unmanned，experimental aircraft just 12 feet long.It achieves hypersonic speed using a special sort of engine known as a scramjet(超音速冲压式喷气发动机). For an engine to burn fuel and produce energy，it needs oxygen.A jet engine，like those on passenger airplanes，gets oxygen from the air.A rocket engine typically goes faster but has to carry its own supply of oxygen.A scramjet engine goes as fast as a rocket，but it doesnt have to carry its own oxygen supply. | 
