题目

下图为某草原生态系统中的食物网示意图,请据图回答: (1) 在此生态系统中生产者是,数量最少的生物是,青蛙和蜘蛛是关系。请写出图中最长的一条食物链。若该环境受到了汞污染,图中体内汞含量最高的生物是。 (2) 在草原生态系统的组成中,图中未画出的生态系统的组成成分是和。 (3) 有些昆虫的体色会随着季节的变化而变化,与周围环境基本保持一致,这说明生物能够环境。 (4) 该草原生态系统中,在没有词汇运用(本题共有15小题, 每小题1分, 共计15分)A.用方框中所给词的适当形式填空,每词限用一次。hang wealthy hundred they hear from1.I was very surprised when I a stranger from a village far away.2.—What do you think of the sweater which he is over there ?— It looks so smart .3.Everyone should take care of because health is the most important in life.4.Last year of people died in the air crash.5.Knowledge makes one laugh, but makes one dance.
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