No product is allowed to go into the market if it fails to _____ the quality standard.

A．live

B．come up to

C．meet

D．go through

糖尿病是现代疾病中的第二杀手，它对人体的危害仅次于癌症。胰岛素制剂是治疗糖尿病的特效药，但是胰岛素只能注射不能口服，原因是_________________。