下列哪项不属于肉芽组织的功能？（）
A.机化凝血块
B.抗感染
C.填补伤口
D.保护创面
E.伤口收缩
参考答案：E
—How about coming to see me in the office tomorrow afternoon?
—________，but I have to meet a guest at the airport.
A．All right
B．Sounds great
C．No problem
D．No，I am very sorry
命题“对任意x∈R，都有x2+2x+5≠0”的否定是______．
