Try to memorize what you will say is very helpful.
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You can occasionally throw in an off-the -cuff remark.
A. 对
B. 错
After you have decided on your opening remark or line，write down every single point in detail.
A. 对
B. 错
Impromptu speech means no preparations
A. 对
B. 错
局麻药的封闭疗法，其主要作用机制是
A. 使神经支配的肌肉发生代谢改变，减轻疼痛
B. 阻断神经冲动的传导，减轻疼痛
C. 使神经支配的肌肉发生功能改变，减轻疼痛
D. 使神经末梢释放的神经营养因子减少
E. 减少致痛物质的释放
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