________ at failing in the maths exam, John wouldn't like to talk about it to his parents.[ ]

A. Disappointed

B. To be disappointed

C. Disappointing

D. Having disappointed

下列哪项指标是黄花鱼的次鲜感官指标______。

A．角膜透明

B．肌肉有弹性

C．黏膜呈鲜红色

D．眼球平坦或稍凹陷

E．肌肉与鱼骨脱离