C．giving different figures

　　D．telling personal experiences

　　【参考答案】51-55 ADCBD

　　C6 [2017·重庆卷]

　　Almost every machine with moving parts has wheels, yet no one knows exactly when the first wheel was invented or what it was used for.We do know，however，that they existed over 5，500 years ago in ancient Asia.

　　The oldest known transport wheel was discovered in 2002 in Slovenia.It is over 5，100 years old.Evidence suggests that wheels for transport didn't become popular for a while, though.This could be because animals did a perfectly good job of carrying farming tools and humans around.

　　But it could also be because of a difficult situation.While wheels need to roll on smooth surfaces, roads with smooth surfaces weren't going to be constructed until there was plenty of demand for them.Eventually，road surfaces did become smoother, but this difficult situation appeared again a few centuries later.There had been no important changes in wheel and vehicle design before the arrival of modern road design.

　　In the mid－1700s，a Frenchman came up with a new design of road—a base layer (层)of large stones covered with

　　a thin layer of smaller stones.A Scotsman improved on this design in the 1820s and a strong，lasting road surface became a reality.At around the same time，metal hubs(the central part of a wheel) came into being，followed by the pneumatic tyre(充气轮胎) in 1846. Alloy wheels were invented in 1967, sixty years after the appearance of tarmacked roads(柏油路)．As wheel design took off, vehicles got faster and faster.

【2017届高考英语一轮专项训练：阅读理解（5）及答案】相关文章：

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（4）附答案

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修8 unit1《A land of diversity》

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修5 unit4《Making the news》

★ 2017届高考英语二轮复习大题冲关秘籍阅读理解七选五：创新押题（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修5 unit3《Life in the future》

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：4（含解析）

★ 河南省三门峡市2014高考英语一轮（暑假）基础训练（9）附答案

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（25）附答案

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 1 A卷 Word版含解析

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（12）及答案