It also awards me _____ opportunity to learn American culture at _____ first hand.

A．/; the

B．the; a

C．an; /

D．/; a

肾病综合征

A．水肿、血尿、高血压
B．血尿、贫血、肾功能衰竭
C．发作性肉眼血尿，无水肿与高血压
D．水肿、蛋白尿、高血脂、低蛋白血症
E．水肿、血尿、蛋白尿、高血压