单项选择题

A．in the seventh century A. D.
B．certainly before 700 B. C.
C．over three thousand years ago
D．a thousand years ago
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单项选择题
A．In the early 1810s.B．In the early 1820s.C．In the early 1830s.D．In the early 1840s.
A．In the early 1810s.
B．In the early 1820s.
C．In the early 1830s.
D．In the early 1840s.
填空题
Why are some engineers trying to improve the handlebars
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