单项选择题

A．Unemployment.
B．Family breakup.
C．Mental problems.
D．Drinking.
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单项选择题
I think symmetry may be the only way to achieve simplicity, so it’’s important enough to be mentioned on its own.
A．Y
B．N
C．NG
单项选择题
A special-purpose lane system is probably advantageous in that ______.
A．it would require only minor changes to existing highways
B．it would achieve the greatest highway traffic efficiency
C．it has a lane for both automated and partially automated vehicles
D．it offers more lanes for automated vehicles
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