C．Animals were a good means of transport.

　　D．The existence of transport wheels was not known.

　　答案　C

　　解析　细节理解题。从第二段中的“This could be because animals did a perfectly good job of carrying farming tools and humans around.”可知，正确答案为C项。

　　2．What do we know about road design from the passage?

　　A．It was easier than wheel design.

　　B．It improved after big changes in vehicle design.

　　C．It was promoted by fast­moving vehicles.

　　D．It provided conditions for wheel design to develop.

　　答案　D

　　解析　推理判断题。从第三、四段的描述我们可知，道路的设计为轮子的发展提供了条件。

　　3．How is the last paragraph mainly developed?

　　A．By giving examples.

　　B．By making comparisons.

　　C．By following time order.

　　D．By making classifications.

　　答案　C

　　解析　组织结构题。从最后一段中的In the mid­1700s；in the 1820s；At around the same time；in 1967等可看出该段是按时间顺序组织起来的。

　　4．What is the passage mainly about?

　　A．The beginning of road design.

　　B．The development of transport wheels.

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