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

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

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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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