柑橘主要分布于我国南方,苹果主要分布于我国北方,造成这一分布差异的主要生态因素是( )
A:温度
B:水分
C:阳光
D:土壤
根据对话内容,选择适当的选项补全对话,使对话完整。
A. She is a doctor. B. Yes. I have one aunt.
C. Good afternoon. D. Is this your aunt?
A: ____
B: Good afternoon.
A:____
B: No, this is my mother.
A: What does she do?
B:____
A: Do you have any aunts?
B:____ She is a nurse.
食用下列物质与人体微量元素的摄入无关的是( )