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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.
D. By making classifications.
67. What is the passage mainly about?
A. The beginning of road design.
B. The development of transport wheels.
C. The history of public transport.
D. The invention of fast-moving vehicles.
