【单选题】体内不能合成维生素 C ,维生素 C 必须来源于饲料中的动物是
【判断题】The main clause of “Tom says it’s a fine day.” is “it’s a fine day.”
【单选题】体内不能合成维生素C,维生素C必须来源于饲料中的动物是
【判断题】人体抵御感染保护性免疫应答包括特异性免疫和非特异性免疫。()
【判断题】The clause “Tom says it’s a fine day.” is an independent complex clause and also a complex sentence.