第2题: [单项选择]钢轨闪光焊落锤检验时，60kg/m钢轨焊接接头要求应符合（）。 A. h=4.2m，1次不断或h=3.1m，2次不断 B. h=4.2m，1次不断或h=2.5m，2次不断 C. h=6.4m，1次不断或h=2.5m，2次不断 D. h=5.2m，1次不断或h=3.1m，2次不断 参考答案:D
第13题: [单项选择]Children who start speaking late ______. A. may have problems with their hearing B. usually pay close attention to what they hear C. often take a long time in learning to listen properly D. probably do not hear enough language spoken around them 参考答案:C 答案解析:[解析] 推理判断题。文章第一段第二句提到late starters are often long listeners(学说话越迟，孩子听的时间就越长)，解答此题的关键是理解long listener
