题目

  A class at Pearson School was learning that people should help each other. They said, “Let’s find someone in our town who needs help.” The class found an old woman. She lived by herself and her house was old and dirty. The class decided to help her. first, they painted the whole house, and then they cleaned the windows. They even planted some flowers in the front yard. After they finished, the woman had a nice-looking home. It took the class three weeks, they were tired but happy because they worked to help someone. Judge the following sentences true (A) or false (B) according9．学校旗杆顶端装有一个滑轮，该滑轮是定滑轮，使用它的目的是改变力的方向．