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【单选题】
某同学利用徒手切片的方法制作蚕豆叶临时玻片标本并用显微镜观察,其操作过程错误的做法是
A.
把新鲜叶片平放在小木板上
B.
右手捏紧并排的两片刀片向自己身体方向水平斜向拉切
C.
用毛笔将切下的薄片刷在清水的培养皿中
D.
在载玻片中央滴一滴清水，用毛笔挑一较薄的材料放在水滴中即用显微镜进行观察
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