— I just can’t stop worrying about the school results of the midterm examination.

— _______. There is nothing you can do now but study hard, keep calm and do your best.

A．Relax

B．Go ahead

C．Go for it

D．Good luck

患者男性，65岁。近半年来出现口干舌燥，烦渴引饮，尿频量多，多食易饥，大便秘结，皮肤干燥，半年来体重减轻10余斤。舌红而干，苔薄黄，脉细数 该病的主要病机是什么（）

A.阴虚

B.气阴两虚

C.阴虚燥热

D.火热内炎

E.肾阴亏虚

F.肺胃津伤