加碘预防地方性甲状腺肿是（） A.一级预防 B.二级预防 C.三级预防 D.慢性病的

（     ）1. What shape is it?                                                  A. Here's some bread for you.  
（     ）2. I'm hungry.                                                         B. No, there weren't.
（     ）3. Hello, may I speak to Helen?                                 C. Yes, he is.
（     ）4. Were there any fruit trees on the farm?                  D. It's a rectangle.      
（     ）5. Is Mike as tall as David?                                       E. Yes, speaking.