单项选择题

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

A．alternative
B．equivalence
C．exchange
D．substitute
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单项选择题
I wandered through the cool ______ of the forest trees.
A．shadow
B．darkness
C．freshness
D．shade
单项选择题
That he got there within such a short time was a ______ to me.
A．wonder
B．miracle
C．marvel
D．surprise
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