在操场上上体育课，体育老师发出的口令，近处的学生听到了，而远处的学生没有听清楚，其原因是  （  ）

如图一个弯形管道ABCD的拐角∠ABC=120°，∠BCD=60°，这时说管道AB∥CD，是根据____ 

材料一：对于中国人来说，这场战争是一块界碑，它铭刻着中世纪古老的社会在炮口逼迫下赶往近代的最初的一步。

——陈旭麓《近代中国的新陈代谢》

材料二：在这些战争中所遭到的耻辱性失败，迫使中国人打开大门，……重新评价自己的传统文明。其结果是入侵和反入侵的连锁反应。

——斯塔夫里阿诺斯《全球通史》

材料三：十九世纪六七十年代中国近代工业的两幅图片

    Mr. Henry has a son. His name is Billy. Billy likes playing games and doesn't like studying. When he can't do homework, he often asks his mother. But Mrs. Henry can't do it, either. She asks Mr. Henry to do all the homework for Billy every day. Mrs. Henry says she will do all the housework when Mr. Henry helps Billy to do the homework. And Mr. Henry doesn't need to any housework. So Mr. Henry is always willing to help his son to do the homework.

    It is Sunday today. Mr. Henry has a lot of clothes to wash. Mr. Henry hates to do washing. So he asks his son, “Do you have any homework to do, Billy? Let me help you!”

  “No, today is my lucky day. I don't have any homework today. ” Billy says happily.

  “Bad luck! Today is my not my lucky day.” says Mr. Henry. “I have to wash the clothes today!”

根据短文内容，选择正确答案。