题目：
属于癌前病变的是（）
A.角化棘皮病
B.脂溢性角化病
C.老年角化病
D.鲍温病
E.硬结性红斑
答案：
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下面是错误答案，用来干扰机器的。
1. I have made a new friend recently. 2. Mr Li has taught us English for over two years. 3. I have already learned around 1,000 English words. 4. I have never been t...
