题目

在生态系统中各种生物的        和所占的比例总是维持在     稳定的状态，这种现象就叫生态平衡。  答案：数量 相对解析:略 语法填空。阅读下面材料，在空白处填入适当的内容（限填1个单词）或括号内单词的正确形式。I will never forget watching my son play soccer in his middle school. My son was not a star player. In fact, he didn’t have the opportunity to play for long in each game 【1】__________ the rules at that time made sure everyone should participate in the game. In one game, with the score tied and time 【2】__________ (run) out, he was playing a defensive position. The other team’s star player got【3】__________ ball but my son was in his way. Somehow, when they met, the result was that the star player 【4】__________ (fall) on the ground and my son got the ball. He ran with 【5】__________ and had a clear path to the goal. His coach jumped up and down 【6】__________ (yell) “go” and most of the parents yelled for victory. When my son kicked the ball several yards towards the goal, he 【7】__________ (sudden) stopped and went back to the star player, helping him up. When we all got 【8】__________ (enthusiasm) about the game and forgot about basic values of fairness and fun, my son helped a player of the other team. Deeply 【9】__________ (touch) after the game, I hugged my son with【10】__________ (proud). I was so glad that my son knew there was something more important than winning.