酶的催化作用特点是
A. 酶的催化作用不受调节
B. 酶具有极高的催化效率
C. 酶对催化的底物有选择性
D. 酶与底物的结合是不可逆的
E. 酶的催化能力不稳定
What is the most important quality that characterizes a good speech?
A. well-polished language
B. interesting opening
C. smooth flow of information
D. valuable ideas to share with
Which one is not one of the Cs that makes a great speaker?
A. character
B. charisma
C. confidence
D. content
Which is NOT a tip that that you can utilize to overcome stage fright when giving a public speech?
A. recite the speech many times to make sure you can remember every word
B. choose the appropriate topic with which you are familiar
C. believe that most listeners are not fault-finding
D. prepare thoroughly and visualize your success
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