—Thank you for _____ me.
—It's my pleasure.[ ]
A. help
B. to help
C. helping
D. helps
答案:C
脑膜炎奈瑟菌的致病因素有()
A.内毒素
B.荚膜
C.外膜蛋白(OMP)
D.菌毛
E.神经毒素