—Why do you like koala bears?

—___ they are cute and smart. [ ]

A. And

B. For

C. Because

D. so

男，21岁。骑自行车撞在右腰部，伤后腰部痛，无肉眼血尿。查：尿常规：红细胞充满/Hlp，血压、脉搏正常，右腰部无包块，但叩击痛，诊断哪种损伤确切

A．重度肾损伤

B．肾挫伤

C．中度肾损伤

D．肾血管损伤

E．输尿管损伤