【单选题】When______ scientists first suggested the possibility that one person should speak directly over a long distance, few people took them seriously.
【单选题】下图中1~4表示某细胞的部分细胞器,下列有关叙述正确的是
B.
动物细胞中存在结构②,它与细胞的有丝分裂有关
C.
结构①是细胞进行有氧呼吸的主要场所,结构③主要是细胞内蛋白质合成和加工以及脂质合成的“车间”
【单选题】When meeting with only one person, it is best to sit _____________.
A.
directly opposite each other
B.
on the person's right side
C.
between three and five feet away
D.
directly opposite each other and between three and five feet away
E.
on the person's right side and between three and five feet away
【单选题】便血,血色鲜红,不与粪便混合仅粘附于粪便表面,提示
【单选题】线粒体是动植物共有的细胞器,其主要作用是
【单选题】现行药典中规定水丸含水量不得超过() *
【简答题】When does a person have to wait for a reply two days or longer? One has to wait for two days or longer if he pays______.