于先生对国债很感兴趣，下列有关国债的说法错误的是()。
A. 按债券形态分类国债可分为实物国债、凭证式国债和记账式国债
B. 实物国债是一种具有标准格式的纸制印刷的记名债券
C. 凭证式国债没有统一格式的票据，而是由发行机构向投资者出具收款凭证的国债
D. 记账式国债是在凭证式国债的基础上进一步取消收款凭证，交易更为灵活的国债
Beethoven knew that he was going deaf______.
A. after he had consulted doctors
B. when he could not hear himself humming the music
C. when he heard a humming noise
D. when the humming noise grew louder
下列基准地价资料调查的一般要求中表述错误()
A. 样本分布要均匀
B. 样本要有代表性
C. 样本抽样采用分类等比抽样调查
D. 每级样本总数不少于30个
Who are being allowed to return home tonight？
A. The evacuated residents.
B. Escambia County spokeswoman Sonya Smith.
C. People who fight hurricane.
D. People who fight tropical storm.
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