题目

阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。 续写的词数应为150 左右。Several years ago, I traveled by train to Stockholm. I was visiting two friends who were to meet me at the train station. I stood there waiting for my first friend to arrive and in the midst of all the hurrying passengers that Friday afternoon, I heard a weak voice; it sounded like a question. I turned and saw a young man standing with a white cane ( 拐 杖 ) , his suitcase by his feet. I approached and asked,“Do you need help?”“Yes,”he repl如图为二次函数（a≠0）的图象，则下列说法：①a＞0 ②2a+b=0 ③a+b+c＞0  ④当﹣1＜x＜3时，y＞0其中正确的个数为（      ）. A．1      B．2      C．3      D．4