短文改错

    One day, little Tony went to a shopping center with his parent. It was very crowded. Tony saw a toy on a shop window. He liked it so very much that he quickly walked into the shop. After looks at the toy for some time, he turned around and found where his parents were missing. Tony was scared and begun to cry. A woman saw him crying and telling him to wait outside a shop. Five minutes later, Tony saw parents. Mom said, “How nice to see you again! Dad and I were terrible worried.” Tony promised her that this would never happen again.

《通典·职官》记载：（汉武帝）“令诸侯十月献酎金，不如法者，国除，其县邑皆别属郡。……自后诸侯王唯得衣食租税。”关于以上材料的说法正确的是

（Ⅰ）当a=1时，求不等式f（x）≥3x+2的解集

（Ⅱ）若不等式f（x）≤0的解集为{x|x≤﹣1}，求a的值．

 下列估测数据中，与实际情况最接近的是（　　）