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.
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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"
单项选择题
According to the passage, when did modern bicycles first appear
A．Twenty years before 1876.
B．Around 1887.
C．About 1876.
D．In the late eighteenth century.
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