单项选择题

双音是指（）只手（）弹奏（）音程的两个音。

A．一；同时；不同
B．一；分别；不同
C．两；同时；不同
D．两；分别；不同

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单项选择题

One disadvantage of gold as the basis for a currency is

A．all of the above.
B．a new discovery of gold could quickly change the value of the currency.
C．gold is difficult to transport in large quantities.
D．a gold standard can be costly to maintain if the currency comes under speculation.

演讲需要注意细节问题，包括仪容仪表，上下台设计、体语的设计等等。

答案：正确