The researchers are working hard to find the optimal concentration of this drug.

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问题 The researchers are working hard to find the optimal concentration of this drug.

选项 A、most poisonous
B、most likely
C、most famous
D、most desirable

答案D

解析 划线词optimal adj.“最佳的,最理想的”。四个选项中,A项poisonous adj.“有毒的”;B项likely adj.“很可能的”;C项famous adj.“著名的”;D项desirable adj.“合意的,悦人心意的”。译文:科研工作者正在努力开发这种药物的浓缩剂。
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