Jack likes playing             soccer, but he doesn't like playing             piano. [ ]

A. /, /

B. the, /

C. the, the

D. /, the

细胞因子的生物学作用不包括( )

A．促进炎症反应
B．抗病毒作用
C．抗肿瘤作用
D．特异性结合抗原