(练习)课时分层作业9 Unit 3 Back to the Past-【提分教练】2023-2024学年新教材高中英语选择性必修第三册(译林版2020)

课时分层作业(九) Ⅰ．阅读理解 A The moon, which has experienced a distinct and complex geological history, presents a striking appearance.The moon may be divided into two major terrains: the Maria (dark lowlands) and the Terrace (bright highlands).The contrast in the reflectivity (the capability of reflecting light) of these two terrains suggested to many early observers that the two terrains might have different compositions, and this assumption was confirmed by missions to the moon such as Surveyor and Apollo. One of the most obvious differences between the terrains is the smoothness of the Maria in contrast to the roughness of the highlands.This roughness is mostly caused by the abundance of craters: the highlands are completely covered by large craters, while the craters of the Maria tend to be much smaller.It is now known that the vast majority of the moon's craters were formed by the impact of solid bodies with the lunar surface. Most of the near side of the moon was thoroughly mapped and studied from telescopic pictures years before the age of space exploration.Earth­based telescopes can recognize objects as small as a few hundred meters on the lunar surface.Close observation of craters, combined with the way the moon diffusely reflects sunlight, led to the understanding that the moon is covered by a surface layer with strange, winding marks.Although various land forms were discovered, the majority of astronomers' attention was fixed on craters and their origins. Astronomers have known for a fairly long time that the shape of craters changes as they increase in size.Small craters have relatively simple shapes.They have round­edged tops that are raised above the surrounding terrain, smooth, bowl­shaped insides, and depths that are about one­sixth their diameters.The complexity of shape increases for larger craters. 【语篇解读】　本文是一篇说明文。文章指出月球经历了独特而复杂的地质历史，呈现出惊人的外观，并详细介绍了月球地表特征以及区别。 1．What does the text mainly discuss? A．The aim of the Surveyor and Apollo space missions. B．Cha