单项选择题

Dogs usually have an _______ sense of smell.

A．accurate
B．acute
C．exact
D．excessive

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多项选择题

衡量压电材料性能的参数有哪些？
A、压电系数
B、机电耦合系数
C、机械品质因数
D、频率系数

Today, Sara and Michael live in a handsome, _________ home they made by their own.

答案： enegy-efficient