There are some ______________ in Xinjiang. ( )
A:horse
B:horses
C:house
— Could you tell me ___________?
— Sorry, I don't know. I will call you when he comes back.
赫尔希和蔡斯做了噬菌体侵染细菌实验,下列叙述正确的是
营养专家认为菠菜中铁的含量较高,缺铁性贫血患者多食用菠菜,对疾病的治疗有一定的疗效。你认为菠菜所影响的缺铁性贫血患者合成的化合物名称及最终决定菠菜含铁量较高的化合物分别是( )