单项选择题

关于酶促反应特点的叙述,正确的是 A.
酶对底物无选择性 B.
酶的活性不受任何因素的调节 C.
酶的活性稳定 D.
与一般催化剂催化效率类似 E.
酶的活性不稳定,易受温度及酸碱度等因素影响

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In the US, the parents would educate their kids by using the following methods: learning bicycle repair rather than taking a bike to a mechanic's shop; sewing clothing rather than buying new clothes and saving recyclable materials.________

答案：正确

单项选择题

刑法具有第二次规范性，处于保障法的地位，因而刑法不具有独立性。
A、正确
B、错误