There is no doubt about the______of the medicine, only it’s a little too cosdy.

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问题 There is no doubt about the______of the medicine, only it’s a little too cosdy.

选项 A、price
B、effectiveness
C、weakness
D、existence

答案B

解析词汇题。A．价格；B．有效性，效力；C．弱点，软弱；D．存在。依据词义辨析和句意，应该选B。

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