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单选题
What is the relationship between “lactase” and “lactose” according to the passage?
A
Lactase is indispensable to decomposing lactose.
B
They both can act as a kind of enzyme.
C
Lactase is the physical form of lactose.
D
Lactase can be used to synthesize lactose.
参考答案
参考解析
解析：
由第六段可知，“lactose”是一种乳糖，“lactase”是人体内消化乳糖的酶，当人在2至5岁之间“lactase”停止分泌的时候，正常人则不能消化“lactose”。由此推断，lactase是分解lactose所必需的，A项正确。
由第六段可知，“lactose”是一种乳糖，“lactase”是人体内消化乳糖的酶，当人在2至5岁之间“lactase”停止分泌的时候，正常人则不能消化“lactose”。由此推断，lactase是分解lactose所必需的，A项正确。
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