【单选题】Today, bicycles are elegantly simple machines that are common around the world. Many people ride bicycles for recreation, whereas others use them as a means of transportation. The first bicycle, calle...
A.
persuade readers to use bicycles for transportation.
B.
describe the problems that bicycle manufacturers encounter.
C.
compare bicycles used for fun with bicycles used for transportation.
D.
tell readers a little about the history of the bicycle.
【单选题】Today, bicycles are elegantly simple machines that are common around the world. Many people ride bicycles for recreation, whereas others use them as a means of transportation. The first bicycle, calle...
【单选题】Today, bicycles are elegantly simple machines that are common around the world. Many people ride bicycles for recreation, whereas others use them as a means of transportation. The first bicycle, calle...