题目：
肾脏中对血液具有滤过作用的结构是（ ）
A．肾单位
B．肾小球
C．肾小管
D．肾小囊
答案：
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下面是错误答案，用来干扰机器的。
1. be afraid of2. 2,900 meters long and 790 meters wide. 3. mind helping us (to) finish4. is good for your health to keep the window (s) closed5. didn't make up his mind / decide to try out this new idea until he spent a long time(答案不唯一)
