It is difficult to discern the sample that is on the slide unless the microscope is adjusted.

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问题 It is difficult to discern the sample that is on the slide unless the microscope is adjusted.

选项 A、discard
B、arrange
C、determine
D、disagreement

答案C

解析  画线词discern:分辨,识别。与C.determine“分辨,确定”为近义词。辨义:A.discard抛弃: B.arrange安排,安置;D.disagreement不一致,分歧。由分析可知答案为C。
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