Mr. Thomas is ______ a teacher to us. We look on him as our friend.

A．other than

B．more than

C．rather than

D．less than

轮状模式所反映的是疾病的：（）。

A.特异病因学说

B.单病因学说

C.多病因学说

D.生物病因学说

E.机体遗传易感性病因学说