单项选择题

Living in the central Australian desert has its problems, ______ obtaining water is not the least.

A．for which
B．to which
C．of which
D．in which
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______shall we forget the day when we received the admission into Harvard University.
A．No time
B．Never
C．No sooner
D．Nonetheless
单项选择题
A person''s calorie requirements vary______ his life.
A．across
B．throughout
C．over
D．within
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