1.问题提出每次从菜市场里买回蔬菜,家长总要反复洗涮浸泡,有时还要加点盐或果蔬清洗剂。这么新鲜翠绿的蔬菜为什么还需要反复清洗?家长说:“看着新鲜翠绿,其实已被污染了!”真是这样吗?那蔬菜是怎样被污染的?究竟污染到什么程度,能采取什么对策?带着这些疑问,在地理老师指导下,活动小组特意进行了一番调查研究。 1. Question: Every time you buy vegetables from the market, parents always wash and soak, and sometimes add salt or fruit and vegetable cleaning agents. Why do fresh green vegetables need to be washed repeatedly? Parents said: “Looking at fresh green, it has actually been contaminated!” "Is that true? How is the vegetable contaminated? What level of pollution does it take and what can it take? Countermeasures? With these questions, under the guidance of a geography teacher, the activity team deliberately conducted a survey.