It is not easy to distinguish cultured pearls from______pearls.

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问题 It is not easy to distinguish cultured pearls from______pearls.

选项 A、permanent
B、precious
C、authentic
D、sincere

答案C

解析 形容词辨析题。 authentic意为“真正的,真实的”,强调非人为或非虚假,符合句意。permanent意为“永久的,永恒的;不变的”;precious意为“宝贵的,珍贵的;矫揉造作的”;sincere意为“真诚的,诚挚的;真实的”。
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