农业生产上通常采取合理密植、轮作、套种等措施，其意义是（  ）
①增大光合作用的有效面积 ②增加农田生态系统的恢复力稳定性 ③充分利用生长季节 ④充分利用土地资源 ⑤充分利用水、肥和光能

根据对话内容及问题选择正确答案（  ）

下列说法符合史实的（   ）

C

My name is Mary. I am an English girl. I'm twelve. My dad and mom are English teachers. I have a brother. His name is Tom and he is thirteen years old. We are in China now. Tom and I are in Beijing No.4 Middle School. Tom is in Class 4, Grade 8 and I am in Class 9, Grade 7.I have a dog. It looks strong(强壮的)．It has a big mouth and two black ears. We have many Chinese friends here. They are kind(和善的).

根据短文内容，判断正误。