单项选择题

Who invented animated road signs

A．Neil Hunt.
B．A driver.
C．Simon West.
D．A teacher.
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单项选择题
The neighborhood boys like to play basketball on that ______ lot.
A．valid
B．vain
C．vacant
D．vague
单项选择题
80（）

A．bad
B．exciting
C．general
D．strange
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