题目

It is in this very village，where Lily was born 30years ago____ she will build her first art school，____ involves many people to help her．（ ） A．that； where      B．which； that      C．that； which      D．where； which 答案：C假定在一个有森林、野兔、狼参与构建的相对封闭的生态系统中，把狼杀绝，兔子的数量将会（　　）A．上升B．先上升后下降C．保持数量的平衡D．缓慢上升