题目

一般情况下，在血管内壁有瓣膜的血管是 A、动脉      B、静脉     C、毛细血管     D、以上都是 答案：B请你按要求写句子。1. He likes eating rice. (改为一般疑问句)_______________________________________________________2. John is from Canada. (对划线部分提问)_______________________________________________________3. My friend is PoDular. (对划线部分提问)_______________________________________________________4. The tiger can swim. (改为否定句)_______________________________________________________5. My favourite animal is the butterfly. (对划线部分提问)_______________________________________________________