下图表示农田生态系统中的两条主要食物链。常常有人大量捕捉青蛙，短期内对该农田生态系统造成的影响是（    ）

阅读短文，选择正确答案。

  Hello, I am Peter. Yesterday was Sunday. I walked to my grandpa's home. It was his birthday. I bought (要) many fruit and a big cake in the morning. My grandpa and grandma liked them very much. My mother cooked the lunch. We had a good time.

请根据下列装置回答有关问题：

写出带有下面偏旁的字，并组词。

鸟：____——____　　____——____

木：____——____　　____——____

土：____——____　　____——____