When to go for the on-salary holiday          yet?

A．are not decided

B．have not been decided

C．is not being decided

D．has not been decided

参与速发型支气管哮喘的主要免疫炎症细胞为（）

A.肥大细胞

B.血小板

C.巨噬细胞

D.中性粒细胞

E.T淋巴细胞