后端部分是对普通用户不可见的，例如从数据库中读取数据（）
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When you are giving the speech, what you should do in the introduction section（）
A. Set the tone
B. Creat interest
C. introduce the topic
D. Grab attention
What are the introduction techniques in presentations which are mentioned in the video clip（）
A. Tell a personal story
B. Ask a question
C. Startling statements
D. Invite a clown to do the opening for you
What are the constructive feedback for the first presenter（）
A. face to the audience
B. Smile more
C. Don’t read notes
D. Slow down a bit
E. To connect with the audience by introducing a personal story
F. Speak louder
Which statement regarding the Python assignment is wrong（）
A. The same variable name can be given different type of values in different location
B. In Python, you do not need to explicitly declare the type of a variable. The type is set according its value
C. Python allows chain assignment and multiple assignment
D. Python assignment is case insensitive
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