原发性肝癌最主要的播散途径是
A．种植转移
B．血液系统
C．淋巴系统
D．直接转移
E．肝内门静脉系统
参考答案：E
His mother wants _____ milk every day.[ ]
A. him drink
B. him to drink
C. him drinking
D. him not to drink
红色光的波长是（）
A、380nm
B、480nm
C、560nm
D、780nm
