购买农药时，农药用下列哪项放置是正确的（）
A.菜篮
B.米萝
C.专门器具
参考答案：C
膀胱癌最常见的临床表现是（）
A.排尿困难
B.尿中有腐肉样物排出
C.无痛性血尿
D.尿频
E.尿流中断
— I am going to the dentist at 4 o'clock and it is 3：30 now.
— Well, if you ______ leave earlier today, please ask the director for permission.
A．can
B．may
C．must
D．will
