单项选择题

A．It’s less expensive.
B．It’s more comfortable.
C．It’s faster.
D．It’s more direct.
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单项选择题
A．To warn of dangers.B．To explain traffic regulations.C．To wake up drivers who are falling asleep.D．To give directions.
A．To warn of dangers.
B．To explain traffic regulations.
C．To wake up drivers who are falling asleep.
D．To give directions.
填空题
The icebergs are rarely seen because ______.
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