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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，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 Sunspots Its not surprising that sunspots(太阳黑子)were observed by ancient astronomers(天文学家).The largest sunspots on the sun can be seen without a telescope.It was not until the invention of the telescope(望远镜)in the early l7th century，however，that systematic studies of sunspots could be undertaken.The great astronomer Galileo was among the first to make telescopic observations of sunspots. Sunspots are regions of extremely strong magnetic fields(磁场)found on the suns surface.A sunspot has a dark central core known as the umbra.The umbra is surrounded by a dark ring called the penumbra，where the magnetic field spreads outward.Sunspots appear dark because they are giving off less radiation.They are cooler than the rest of the suns surface. Sunspots are frequently observed in pairs or in paired groups.The members of a spot pair are identified as the leading spot and the following spot.They are identified by their position in the pair in terms of the direction in which the sun rotates(旋转). | 
