单项选择题

What can be concluded as the remarkable characteristic of the first twenty years of the 20th century

A．Industry.
B．Watchword.
C．Technology.
D．Progress
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单项选择题
What happened in 1920
A．Radio was first used.
B．The first president was elected.
C．The first car came into being.
D．The first airplane was made.
单项选择题
popping the question ( L. 3, Para. 2 ) means______.
A．asking whether her father agrees
B．asking a short question
C．making the marriage proposal
D．expressing his love
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