What is the best title for the passage? According to the passage, what does the underlined word "pedals" mean?

admin2009-04-23 101

问题 What is the best title for the passage?
According to the passage, what does the underlined word "pedals" mean?

选项 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.