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

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

选项 A、overlook
B、disclaim
C、discard
D、detect

答案D

解析 句意:除非显微镜调整得适当,否则要辨别一个滑动的标本是很困难的。discern辨别,识别。detect察觉,探测。overlook忽略。disclaim放弃,不索求。discard丢弃。
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