题目内容：
已知复数 z 在复平面内对应的点的坐标为（2， ﹣ 1）， 则|z﹣ i|＝（）
A.√2
B.2
C.2√2
D.8
参考答案：
答案解析：
选择题：已知复数 z 在复平面内对应的点的坐标为（2， ﹣ 1）， 则|z﹣ i|＝（）
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