题目

  During my high school years, the most important thing was what I was wearing to the Friday night dance and who I was taking．Although college was talked about, it was the least of my worries． When I was graduating eighth grade and starting high school, my elder brother was graduating twelfth grade and going onto college．For my graduation, he gave me a card in which he wrote, “Enjoy your four years…they go by fast．” I remember not believing him then, but looking back…he was right．Those four years shaped who I was as a person, pushed me to my limit and encouraged me to becom（04江苏卷）农田生态系统中，假设有两条主要的食物链：    如果有人大量捕捉蛙，短期内对该生态系统造成的影响是                                    A．有利于生态系统的平衡             B．水稻虫害严重    C．蛇的数量迅速增加                    D．鼠的数量迅速增加