单项选择题

A．Mark is going to Spain.
B．Mark has traveled all over the world.
C．Mark has the habit of collecting postcards.
D．Mark is going on vacation.
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问答题
It is time that the authorities concerned______________________ (采取适当的措施来解决交通问题).
单项选择题
The author mentioned Homer in Para. I to exemplify the fact that______.
A．the present is varying too fast to be caught up easily
B．the future may be so indefinite as to be unpredictable
C．the past can help to shape a consensus in the present
D．the past determines social moralities for later generations
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