单项选择题

An enormous number of people in the world"s poorest countries do not have clean water or adequate sanitation______.

A．capacities
B．facilities
C．authorities
D．warranties
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单项选择题
I have never seen a more caring,______group of people in my life.
A．emotional
B．impersonal
C．compulsory
D．compassionate
单项选择题
Caffeine is the ______drug that will just about get you out of the door on time to catch the bus.
A．miracle
B．myth
C．trick
D．legend
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