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单选题
Which of the following is the CORRECT explanation of “enzyme” (Para. 6)?
A
A kind of chemical hormone that is produced by human body.
B
A kind of protein that act as catalyst in diagnosing lactose.
C
A kind of fungus that can be used to decompose lactose.
D
A kind of gene that is called lactase.
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参考解析
解析：
由第六段“the enzyme that does so—lactase—stops being produced when the person is between two and five years old.”可知人在2至5岁之间，体内消化乳糖的酶——乳糖酶就停止分泌了。由此可知enzyme是由人体产生的一种激素。
由第六段“the enzyme that does so—lactase—stops being produced when the person is between two and five years old.”可知人在2至5岁之间，体内消化乳糖的酶——乳糖酶就停止分泌了。由此可知enzyme是由人体产生的一种激素。
更多 “单选题Which of the following is the CORRECT explanation of “enzyme” (Para. 6)?A A kind of chemical hormone that is produced by human body.B A kind of protein that act as catalyst in diagnosing lactose.C A kind of fungus that can be used to decompose lactose.D A kind of gene that is called lactase.” 相关考题
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