单项选择题

It is reported that there is no better _________ for mother's milk.

A．alternative
B．exchange
C．equivalent
D．substitute
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单项选择题
Although it takes up much of his spare time, Mr. Smith finds stamp collecting extremely _________.
A．progressive
B．encouraging
C．rewarding
D．challenging
单项选择题
From the sad look and tears in her eyes we can _________ that something unhappy must have occurred to the poor girl.
A．conclude
B．anticipate
C．exclude
D．include
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