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

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

选项 A、alternative
B、exchange
C、equivalent
D、substitute

答案D

解析 substitute for sth.“作为……的代用品”:alternative“供选择的东西”;exchange“交换”;equivalent“相等的东西”。
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