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

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

admin2012-06-26  27
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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