—How does Bob usually go to work?

—He _______ take a bus, but now he is used to (习惯于) walking. [ ]

A. used

B. was used to

C. used to

D. is used to

关于介入放射学的应用范围的叙述，错误的是

A．介入放射学是采用选择或超选择性血管造影

B．介入放射学分血管和非血管技术

C．血管技术是在血管内进行的治疗和诊断性操作

D．非血管技术是在血管以外进行的治疗和诊断性操作

E．介入放射学不属于临床医学范畴