题目

在“探究加速度与力、质量的关系”的实验中，采用图8所示的装置．（1）本实验应用的科学方法是       A．建立理想模型的方法         B.控制变量法  C.  等效替代法                D.类比法 （2）某同学测得小车的加速度a和拉力F的数据如下表所示：（小车质量保持不变） F/N0.200.300.400.500.60 a/m·s-20.100.200.290.400.51 ①根据表中的数据在坐标图上作出a-F图象． ②图线不过原点的原因可能是                    ．语法填空（共10小题，每小题1.5分，满分15分）Once there lived a rich man 1. wanted to do something for the people of his town. 2. first he wanted to find out whether they deserved his help.In the centre of the main road into the town, he placed 3. very large stone. Then he 4. (hide ) behind a tree and waited. Soon an old man came along with his cow.“Who put this stone in the centre of the road?” said the old man, but he did not try to remove the stone. Instead, with some difficulty he passed around the stone and continued on his way. 5. man came along and did the same thing; then another came ,and another. All of them complained about the stone but not tried to remove 6. . Late in the afternoon a young man came along. He saw the stone, 7. (say) to himself: “The night 8. (be) very dark. Some neighbors will come along later in the dark and will fall against the stone.”Then he began to move the stone. He pushed and pulled with all his 9. (strong) to move it. How great was his surprise at last! 10. the stone, he found a bag of money.