六、閱讀測驗（每題 2 分，20%)The first bicycle, which was invented in 1817, was a walking machine that helped people to walk faster. It hadtwo wheels of the same size. A man could stand over a bar above the wheels with his feet on either side of thebar, touching the ground.A machine invented in 1865 had pedals attached to the front wheel. Like the walking machine, it was madeentirely of wood. Although it was very uncomfortable to ride, it became quite popular.The first all-metal machine was invented in 1870. It had one large and one small wheel and hard rubber tires.The pedals were still attached to the front wheel, above which there was a seat. This machine was the first one tobe called a bicycle. Although it was difficult and dangerous to ride, it was a very popular machine.The next machine had the small wheel at the front. However, it was not very comfortable, so it was not sopopular.The bicycle as we know it today was not made until 1898. It had rubber tires filled with air, and it was muchmore comfortable. The bicycle was not very popular with all kinds of people. It was so popular with womenthat they changed the way they dressed to make bicycling possible. 
31. When was the first machine to be called a bicycle invented?
(A) 1817
(B) 1865
(C) 1898
(D) 1870