Mr. Andrew taught his students how to develop the basic skills in the physics class, ______ everything through jokes and experiments.

A．to explain

B．explained

C．explaining

D．explains

可用于晚期恶性肿瘤患者一恶病质，改善其肿瘤相关厌食的药物是（）

A.醋酸强的松龙

B.乙炔雌二醇

C.醋酸甲地孕酮

D.地塞米松

E.甲氨蝶呤