【单选题】下列说法正确的是( )
D.
凡含有食品添加剂的食物对人体健康均有害,不可食用
【单选题】.Hi, Jessy, nice to see you! Hi, Linda, nice to see you too. I ____________you would come to the meeting.
【单选题】听力原文:W: Hi, John. Nice to meet you. M: Hi. You are...? W: I'm Mary. Don't you remember me? Your younger sister Susan is my good friend. I used to go to your home when you were still home. M: Yeah, yea...
【单选题】下列说法不符合原文意思的一项是( )。
B.
人工合成的化学农药杀虫成分单一化,因而害虫容易产生抗药性
C.
植物农药防治农作物虫害的原理主要是驱赶害虫和破坏抑制害虫的生理机能
【简答题】食品中的酸度可以分为哪几种,各有什么含义?