同学你好，该知识点来自沪江网校《英语零基础直达大学六级【8月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
you have the choice of very expensive organically-grown vegetables or a steady diet of pesticides every time you think you're eating fresh salads and vegetables, or just having an innocent glass of water

every time you think you're eating fresh salads and vegetables, or just having an innocent glass of water  这是时间状语从句
当你认为在享用新鲜色拉和新鲜蔬菜或饮用一杯无害的水的时候
这里you're eating fresh salads and vegetables和or just having an innocent glass of water其实是并列的两部分，中间语气停顿了，所以用逗号隔开了，翻译的时候是翻译在一起的。

祝同学学习进步~