声音的表情性是指：传播者以不同的语音、语调、语速、停连、音量表达不同的内容，就会传递不同的感情。
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若在一区间上,曲线总在它每一点的切线上方,则曲线在这区间是( ).
A. 递增
B. 上凹
C. 递减
D. 上凸.
In U.S.A.,the power to enforce and interpret the laws is the responsibility of ( )
A. The Judicial Branch
B. The Executive Branch
C. The Legislative Branch
In U.S.A.,the power to make new laws is the responsibility of ( )
A. The Judicial Branch
B. The Executive Branch
C. The Legislative Branch
A bill is:
A. The written text of a proposed law
B. Only a member of the House of Representatives can introduce a bill
C. A member of either the House of Representatives or the Senate can introduce a bill
D. A bill is not yet a law
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