【单选题】According to the passage, choices must be made because________.
A．resources are abundant
B．there is too much for us to do
C．there are only 24 waking hours in a day
D．our means are limited, but our wants are unlimited
【单选题】According to the passage, choices must be made because________.
A．resources are abundant
B．there is too much for us to do
C．there are only 24 waking hours in a day
D．our means are limited, but our wants are unlimited
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