在水平地面上有一长方体木箱，小林用水平推力F把木箱向前推动，如图甲所示，此过程中，推力F随时间t的变化情况如图乙所示，木块前进的速度V的大小随时间t的变化情况如图丙所示，则，从3s到5s内，推力对木块所做的功　____ J，第2秒木块受到的合力为　____ N．

根据短文理解，从给出的A、B、C三个选项中选择最佳答案填空。

    All parents love their children. Many parents want their kids to1 well-known people when they2 . Most of them want their kids to live better than others. Many of them 3their kids will be singers or actors. Actors and singers can 4 money easily in our country. When they appear in the advertisement, they will get 5 money which a farmer or a worker can't make all his life. Some of the parents want their kids to be businessmen6doctors. If they work hard, they will have cars and big houses in several 7. Some parents want their kids to work in cities and towns. They don't 8 them to work in the countryside. People who work in the cities and towns can get money after they 9. If you are a famous man, especially an actor, you'll get much but pay a little. A farmer is 10 , he gets little but pays much.

李白的《望庐山瀑布》中有“遥看瀑布挂前川”之句，后人评述此句的意境全在“挂”字之上。这是因为此字体现了（  ）

①动中有静，静中有动 ②物质是运动的物质，运动是物质的存在方式 ③绝对运动与相对静止是统一的 ④运动是物质的运动，物质是运动的承担者