单项选择题

The earliest bicycles were called "running machines" because ______.

A．people have to run on feet when using the machines
B．they were faster than running men
C．the riders could run on the bicycles
D．the bicycles could run fast automatically

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单项选择题

According to the passage, what does the underlined word pedals mean

A．Something on a bicycle that riders can rest their feet on.
B．A kind of boards on a wheel that can be pressed by foot.
C．Part of the running machines.
D．Levers that drives a bicycle when pressed down by foot.

单项选择题

People called the new kind of bicycle made in about 1876 a safety bicycle because the ______.

A．riders would not fall
B．wheels had hard rubber tyres
C．riders could touch the ground easily
D．wheels were the same size as the "Penny Farthing"