学段:高中学习科目:环保学习时间:2周一、课题的提出据报道,一段时间以来,一种繁殖力极强的“水中狼族”食人鱼频频见诸于全国各大媒体报端,各地相关部门纷纷表示要采取措施严密监控,防止食人鱼流入本地江河。食人鱼又名食人鲳,原产于亚马孙河,外表妖艳,性情残暴,能够在短时间? Learning segment: Senior secondary learning subjects: Environmental learning time: 2 weeks, the subject of the report According to reports, for a period of time, a highly fertile “water wolf” piranhas are frequently seen in major media outlets throughout the country. Departments have expressed that they must take measures to monitor closely and prevent piranha from flowing into local rivers. Piranhas, also known as cannibals, are native to the Amazon and have a flamboyant appearance. They can be brutal and can be in a short period of time.