维生素D缺乏性佝偻病的基本治疗法则是“虚则补之”，其重点在于补肺肾（）
参考答案：错
— Who do you think ________ the book here?
— It may be John. He was sitting here all the morning. [ ]
A. was leaving
B. leaves
C. had left
D. has left
滤泡性淋巴瘤的特点是()
A．多见于中年人
B．瘤细胞呈结节状生长
C．瘤细胞主要为中心细胞和中心母细胞
D．预后较差
E．多数病例瘤细胞表达bcl-2蛋白
