— ____ visited the Shanghai World Expo is sure to tell you the place is worthy ____ twice．

— You can say that again．

A．Those who have; visiting

B．Whoever has; visiting

C．Those who have; to be visited

D．Whoever has; to be visited

与嗜酸性粒细胞无关的趋化因子是( )

A．C3
B．C2b
C．C567
D．正常血清
E．以上都是