人体甲状腺滤泡上皮细胞具有很强的摄碘能力。临床上常用小剂量的放射性同位素131I治疗某些甲状腺疾病,但大剂量的131I对人体会产生有害影响。积聚在细胞内的131I可能直接( )
( ) (7)____ weekends , she gets up a little later. A.onB. atC. in
( ) (6)I have stamps ______ China. A. fromB. forC. at
( ) (5)Bill is good _____ football. A. atB. inC. for
( ) (4)Bill has many______. A. hobbyB. hobbiesC. hobbys
( ) (3)He likes______ vegetables . A. to plantB. plantingC. plants