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【单选题】
某学生使用的显微镜有如下一些镜头可供参考（见下图）。使用该显微镜观察某组织时要使视野中观察到的细胞数目最多，应选择的镜头组合是 [     ]
A.
③和⑤
B.
④和⑥
C.
①和④
D.
②和⑥
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