下列命题中正确的是[ ]

A．所有的等腰三角形都相似　　　

B．所有的直角三角形都相似

C．所有的等边三角形都相似　　　

D．所有的矩形都相似

From his demeanor (举止) on entering the room I______that the interview had not gone well for him.

A．informed

B．implied

C．indicated

D．inferred