写作部分：
Integrated Essay:
Reading： An ecosystem called Everglades is faced with three severe environmental threats: an invasive plant; the decrease of the amount of water and mercury which does harm to all the species. 生态系统Everglades面临着三个严重的环境威胁：一，入侵植物；二，水量减少引起干枯；三，汞对所有物种造成损害。
Listening：There are three workable solutions to the problems: First, restrict the use of fertilizer which add too much nutritio
