Hello! I'm Scott. The old woman on the sofa is my grandmother. She is 78 years old, but she is very healthy.

    Every morning, she gets up at 6:00 o'clock. And then she does some exercise for half an hour. For breakfast, she usually has a cup of milk, some bread and an egg. After breakfast, she always goes to the art club. She teaches the people to draw pictures. In the afternoon, she often goes to the park (公园) with her friends. She likes dancing very much. She has dinner with us at 6:30 in the afternoon. After that, she likes to go for a walk with my grandfather. She goes to bed at 9 o'clock.

在20世纪20年代浙江上虞县的下管村，“生产上它是一个农业社会，……下管人除粮食和菜蔬肉类等还能自给自足，并有毛竹和茶叶等山货可以外销外，日常生活的工业品，几乎全是外来的‘洋货’。……除了制造和修理农具和家具的一些手工业外，家庭纺织业等已被淘汰殆尽”。据此可知，近代以来下管村自然经济瓦解的征象是（    ）

重为G的正方体静止在水平面上，若在该正方体上表面的中央施加一个竖直向上的力，其大小为F（F＜G），此时该正方体在竖直方向上所受合力的大小为（　）

卖炭翁

卖炭翁，伐薪烧炭南山中。满面尘灰烟火色，两鬓苍苍十指黑。

卖炭得钱何所营？身上衣裳口中食。可怜身上衣正单，心忧炭贱愿天寒。

夜来城外一尺雪，晓驾炭车辗冰辙。牛困人饥日已高，市南门外泥中歇。

翩翩两骑来是谁？黄衣使者白衫儿。手把文书口称敕，回车叱牛牵向北。

一车炭，千余斤，宫使驱将惜不得。半匹红绡一丈绫，系向牛头充炭直。

请写出一个整系数多项式f（x），使得 $\sqrt{2}+\sqrt[3]{3}$是其一个根．