单项选择题

A．August, 4th
B．June, 26th
C．July, 10th
D．July, 24th
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问答题
1．为什么自行车在中国这样普及；2．与汽车比较；3．自行车在中国的前途。
单项选择题
A．Some birds can only use the sun to guide them.B．Some birds can only use the stars to guide them.C．When it is too dark to see anything, birds still can find their direction.D．Any change in the position of the make-believe stars would cause a change in the direction of the birds flights.
A．Some birds can only use the sun to guide them.
B．Some birds can only use the stars to guide them.
C．When it is too dark to see anything, birds still can find their direction.
D．Any change in the position of the make-believe stars would cause a change in the direction of the birds flights.
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