Lucy’s colour ________blue because she likes to be the leader, so it __________red.   

A．can’t be, must be

B．can’t be, mustn’t be

C．should be , must be

D．must be, can’t be

阻碍细胞有丝分裂的抗恶性肿瘤药是

A．阿霉素

B．长春新碱

C．甲氨蝶呤

D．氟尿嘧啶

E．以上都不是