Auer小体不见于（）
A.M1型白血病
B.M2型白血病
C.M3型白血病
D.急性淋巴细胞白血病
E.急性单核细胞白血病
参考答案：D
—________ do you have an Art Festival in your school?
—Once a year. [ ]
A. How long
B. How often
C. How far
D. How soon
