垂体微腺瘤是指肿瘤直径小于（）。
A.3mm
B.5mm
C.10mm
D.15mm
E.20mm
参考答案：C
At the last moment, Tom decided to ________ a new character to make the story seem more likely.
A．put up
B．put in
C．put on
D．put off
540÷36=540÷9÷4______．
