恶性肿瘤最常发生于下列哪个鼻窦（）。
A.前组筛窦
B.额窦
C.后组筛窦
D.蝶窦
E.上颌窦
参考答案：E
--- ________ you ________ to live in Qiandao Lake?
--- Yes , I did. But in 2005, I came to Hangzhou with my family.
A．Did, used
B．Were, use
C．Do, use
D．Did, use
采用()结算方式的，增值税专用发票开具的时限为发出货物的当天。
A.托收承付
B.分期付款
C.委托银行收款
D.预收货款
