单项选择题

“Respected Chairperson, friends, first of all let me express my sincere gratitude to the Association of Commonwealth Universities for inviting me to this conference.” is an example of ___________.

A.introducing yourself
B.stating your topic
C.summarizing the main points
D.showing gratitude to the audience
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单项选择题

地西泮属于哪一类镇静催眠药?(  )。 

A.丙二酰亚胺类
B.吩噻嗪类
C.三环类
D.苯二氮䓬类