乙肝大三阳指的是哪三项
A. HBsAg
B. HBs
C. HBeAg
D. HBc
乙肝疫苗接种禁忌症包括发热，患急性或慢性疾病，过敏体质者
A. 对
B. 错
What are the effective methods you can use to gain the attention and interest of an audience in the introduction of a speech? ( )
A. Relate the topic to the audience.
B. State the importance of the topic.
C. Startle the audience.
D. Arouse the curiosity of the audience.
The most effective order depends on all of the following things __________
A. your topic
B. your purpose
C. your title
D. your audience
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