He was ______ by his colleagues though he himself didn't think he had done anything

special. [ ]

A. thought little of

B. thought poorly

C. thought highly of

D. thought highly

指出下列哪种是甲型肝炎的主要传播途径

A．垂直传播

B．唾液传播

C．血液传播

D．粪一口传播

E．飞沫传播