(1)原式=2+22+1=3+22;
(2)原式=a2-3a+4-a2=-3a+4.
—Would you mind passing me today’s newspaper?
—_______
A.Yes, please.
B.Yes, I’d love to.
C.You are welcome.
D.Not at all.
专利权的无效宣告的部门应当为
A.专利复审委员会
B.专利局
C.工商行政管理局
D.人民法院