单项选择题

This passage mainly discusses______.

A．water conservation
B．the hydrologic cycle
C．underground water
D．polluted ground water
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单项选择题
If border officials do not stamp the passport, what should a traveler do
A．Request that it be stamped as soon as possible.
B．Refrain from entering the country.
C．Go to the embassy.
D．Get help at the hotel.
单项选择题
What should travelers do if staying in a country for a month
A．Register with their embassy.
B．Leave their passport in the hotel.
C．Find a good hotel.
D．Have extra passport photos taken.
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