多项选择题

根据不同社会制度国家国防政策和国防目标的不同，目前世界上的国防类型主要有（）A、扩张型B、友好型C、中立型D、自卫型

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不定项选择

人类感染甲肝病毒后，大多数表现为隐性感染，仅有少数人表现为急性甲型肝炎。

A．正确
B．错误

单项选择题

What is Jazz music?

A．. It is rooted in traditional African-American music.
B．. Rising out of the pain and injustice of African American history, jazz is a highly expressive and emotive music genre.
C．. Jazz music has also been a major contribution to the music world.
D．. There were few white people who create Jazz music.