填空题

When was the first bicycle invented
The first bicycle was invented（）.

【参考答案】

in 1790

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单项选择题

A．At 6:30.
B．At 6:45.
C．At 7:15.
D．At 7:30.

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Why did many people move to the cities Many people moved to the cities to（）.

When was the first bicycle invented The first bicycle was invented（）. 您的浏览器不支持 audio 元素。