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.

　　64．What might explain why transport wheels didn't become popular for some time?

　　A．Few knew how to use transport wheels.

　　B．Humans carried farming tools just as well.

　　C．Animals were a good means of transport.

　　D．The existence of transport wheels was not known.

　　65．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 fast－moving vehicles.

　　D．It provided conditions for wheel design to develop.

　　66．How is the last paragraph mainly developed?

　　A．By giving examples.

　　B．By making comparisons.

　　C．By following time order.

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