题目

 The floods which happened in India last month left about______ people homeless. A. two thousand     B. two-thousands   C. two thousands   D. two thousands of 答案：              A一个池塘被农药污染，在池塘中有一个食物链：浮游植物→水蚤→鱼→鱼鹰，则体内农药含量最多的生物是（ ）A．浮游生物B．水蚤C．鱼D．鱼鹰