单项选择题


Passage Two
According to the speaker,what can the present-day robots do

A．Drive cars.
B．Fly planes.
C．Pay wages.
D．Repair machines.
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单项选择题
When did watches and clocks become common in the United States
A．From the 1850s.
B．From the 1700s.
C．From the 1800s.
D．From the 1900s.
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