题目

Every year natural disasters kill ________ people.A. three thousands B. thousands of C. thousand of D. three thousands of 答案：【答案】B【解析】句意：每年自然灾害都杀死数以千计的人。three thousand+名词复数，三千个……；thousands of+名词复数，数以千计的……。C ,D选项错误。根据句意及选项结构，故选B。4. The number of private cars in urban areas        while the number of public buses should be increased(limit)在城市，私人轿车的数量应得到控制而公交车的数量应该增加。