Digestion______ the necessary chemical changes in the food which must occur befo

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问题 Digestion______ the necessary chemical changes in the food which must occur before it can be absorbed.

选项 A、consists in
B、feeds in
C、puts in
D、consists of

答案 A

解析 consist in表示“在于”：feed in表示“输入(电脑数据)”：put in意为“插入”、“伸进”；constitute of表示“由组成”。本句意为：“消化就是食物在其被吸收之前必须发生的必要的化学变化。”

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