—Who will teach you to swim this summer?              

—The twins,  because _         Lily      __  Lucy swim very well.          [ ]

A. both, and                  

B. neither, nor          

C. not only, but also                

D. either, or

流行性脑脊髓膜炎的病原菌是（）。

A.流行性乙型脑炎

B.脑膜炎双球菌

C.黏膜奈瑟菌

D.干燥奈瑟菌

E.HSV