单项选择题

In the west, people make______ a rule to send Christmas present to their relatives and friends.

A．this
B．that
C．it
D．the following
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单项选择题
—Can I help you—I'd like to buy a present for my father's birthday, ______ at a proper price, but of great use.
A．that
B．one
C．anyone
D．everything
单项选择题
He said that books on ______ popular science are in ______ short supply.
A．the; a
B．/; /
C．/; the
D．the; the
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