题目内容

下面哪种物质能与硫酸铜的碱性溶液发生显色反应，生成紫红色化合物。（）

A. 氨基酸
B. 二肽
C. 寡肽
D. 多肽
E. 蛋白质

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下面关于酶的叙述正确的是（）。

A. 酶是由活细胞产生的
B. 酶只能催化特异的底物
C. 酶具有高效催化作用
D. 酶的化学本质是蛋白质
E. 一切能够使蛋白质变性失活的因素都可以使酶变性失活

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A. his
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________ can be said that the adoption of shifting perspective is one of the characteristics of Chinese painting.

A. That
B. What
C. It
D. Which

Among these largest artificial articles in the world, ________ originated from the same architect --- Ieoh Ming Pei.

A. little
B. more
C. many
D. much