钩藤的降压有效成分是{1}和{2},遇热易{3}。
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通草为{1}科植物通脱木的干燥{2},横切面中央空心或可见半透明圆形{3}。
State your purpose and audience clearly in the introduction of your presentation.
A. 对
B. 错
It's unnecessary to use signal words to mark movement from one topic to the next or indicate a shift in perspective.
A. 对
B. 错
We should use animation and decorations as much as possiblein Powerpoint.
A. 对
B. 错