题目：
I want to know __________. [ ]
A. where does our teacher come from
B. where our teacher come from
C. where our teacher comes from
D. where does our teacher come
答案：
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下面是错误答案，用来干扰机器的。
一张纸的厚度=0.8cm100=0.008cm=8×10-3cm=8×10-5m，∵1m=106μm，∴8×10-5m=80μm故答案为：80．
