10．优先股是相对于普通股而言的，是指股东有优先于普通股分红和优先于普通股的资产求偿权利的股票。
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11．开放型基金是指基金管理公司在设立基金时，发行基金单位总额不定，可视实际需要连续发行，投资者可随时购买基金单位。
A. 对
B. 错
[音频][音频]
A. Because she wants to take a long vacation.
Because she wants to interview news producers.
C. Because she wants to volunteer for an organization,
D. Because she wants to prepare for the election season.
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A. The woman's husband volunteered to build houses after the hurricane.
B. Over 150,000 volunteers worked for the building of houses after the hurricane.
C. The man's sister also helped to build houses after the hurricane.
D. More than 3,000 new houses were built after the hurricane.
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A. Because she is influence by her husband who is a loyal volunteer of it.
Because she can learn a loft useful skills for building a house.
C. Because she enjoys developing friendships and building communities through volunteer work.
D. Because she loves the feeling of helping the poor to have their own houses.
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