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. |
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. |
A.By giving examples. |
B.By making comparisons. |
C.By following time order. |
D.By making classifications. |
A.The beginning of road design. |
B.The development of transport wheels. |
C.The history of public transport. |
D.The invention of fastmoving vehicles. |
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