The sugar dissolved in water gradually; finally all that remained was an almost______residue on the bottom of the glass.

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问题 The sugar dissolved in water gradually; finally all that remained was an almost______residue on the bottom of the glass.

选项 A、fragrant
B、imperceptible
C、glassy
D、opaque

答案B

解析 fragrant“芬芳的”;imperceptible“无法察觉的”;glassy“像玻璃的”;opaque“不透明的”。根据题意,糖放入水中,就会慢慢溶化,直至水糖一体,几乎看不出任何糖的痕迹。故选B。
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