引起医源性感染的细菌最常见的传播途径是（）

A.经空气传播

B.经污染物传播

C.共同媒介传播

D.媒介昆虫传播

E.经手直接传播

—Whose notebook is this?

—It _____ Jane's. It has her name on it. [ ]

A. must be

B. might belong to

C. may be

D. could be