He is nothing ______ a singer.
A. execept
B. yet
C. however
D. but
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对于流行演唱的共鸣描述错误的是（）
A. 流行演唱时只需要口腔共鸣
B. 流行演唱时所有共鸣腔应该是一体的、协调的
C. 流行演唱时高音应该有胸腔共鸣
D. 流行演唱时低音应该有头腔共鸣
What is the meaning of the word sharp in the sentence “There is a sharp contrast between the lives of the poorest and the richest members of society”？
A. clear
B. pointed
C. sudden
D. fashionable
下列哪种情况应该扩大保护区的范围（)。
A. 汽车火灾现场
B. 起火部位尚未确定的
C. 雷击火灾现场
D. 有自燃物的火灾现场
The book is ______. You should have returned it to the library last week.
A. due
B. overdue
C. expired
D. exceeded
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