完形填空

      Hey, I'm Simon. I have a strong and faithful dog, Bruce. The dog likes1with me. Sometimes he also follows my father to work. One morning when my father worked in the field, he2 his coat and put it under a big tree. He turned  to the dog and said,“3my coat, Bruce!” Bruce sat down on the coat. Later, my father remembered he had to buy some food.  4 he hurried to the shop.   5 shopping, he went home directly and forgot completely about his 6 and the dog. In the evening, I looked for my dog7 in the house, but I8 find him. At this time, my father suddenly remembered his coat and the dog. He went back to the tree   9. He found that Bruce was 10 sitting on the coat!

某沿海地区1999年以来酸雨频率明显增加，其原因可能是该地区（    ）

小明用弹簧测力计、圆柱体、两个相同的圆柱形容器，分别装有一定量的水和盐水，对浸在液体中的物体所受的浮力进行了探究，其装置和弹簧测力计示数如图所示.