如图中关于声现象的描述，正确的是（　　）

过点且垂直于直线 的直线方程为（   ）

    A year ago, I paid no attention to English idioms（习语）, though my teacher told us the importance again and again. But soon, the importance of English idioms was shown in an amusing experience.
    One day, I happened to meet an Englishman on the road, and soon we began to talk. As I was talking about how I was studying English, the foreigner seemed to be surprised. Gently shaking his head，shrugging his shoulders, he said，“You don't say!” “You don't say!” I was puzzled. I thought, perhaps this is not a right topic. “Well, I’d better change the topic.” So I said to him. “Well, shall we talk about the Great Wall? By the way, have you ever been there?” “Certainly, everyone back home will laugh at me if I leave China without seeing it. It was wonderful.” He was deep in thought when I began to talk like a tourist guide. “The Great Wall is one of the wonders in the world. We are very proud of it.” Soon I was interrupted（打断）again by his words: “You don't say!” I couldn't help asking, “Why do you ask me not to talk about it?” “Well, I didn't ask you to do so,” he answered, greatly surprised. I said, “Didn't you say ‘you don't say’?” Hearing this, the Englishman laughed to tears. He began to explain, “ ‘You don't say’ actually means ‘really!’ It is an expression of surprise. Perhaps you don't pay attention to English idioms.” I realized I had made a fool of myself. Since then I have been more careful with idiomatic expressions. Remember: what the English teachers said is always right to us students.

读太阳直射点移动轨迹图，判断太阳直射点向南移动的是（   ）

阅读《韭菜饺子》，完成小题。

韭菜饺子

徐立新

    ①儿子回乡下的老家看父母，但只能在家待一天一夜，第二天早上5点半就要走，临走的前一天晚上，儿子跟母亲坐在老房里一直聊到深夜。

    ②临睡前，儿子有些遗憾地说：“妈，这次太匆忙，等下次有空，我一定在家多待几天陪陪您，还要吃小时候您亲手包的韭菜饺子，那个味道太好了，我一直都想着呢。”

    ③之后，儿子便到里屋睡觉了，可母亲却没了睡意，她走到另一间屋，叫醒已经睡下的父亲，说：“老头子，你赶紧起来，去问问谁家菜园里有韭菜，跟他打个招呼，割点儿回来，娃想吃韭菜饺子了，我得给他做。”

    ④躺在床上的父亲一听，立即明白，连说：“好，好。”然后迅速穿上衣服，下了床。母亲又说：“老头子，你动静小些，别吵醒了娃，他明早还要走呢。”

    ⑤父亲再次“嗯”了两声，然后别上一把菜刀，悄悄打开大门，出去了。

    ⑥此时，正是初冬的深夜，外面很寒冷。

    ⑦父亲开始在村子里挨家挨户敲门，借割他们菜园里的韭菜，冬日，菜园里韭菜很少，好在敲了数十家门后终于找到了。

    ⑧村里各家各户的菜园都离村子很远，加上夜路不好走，等父亲割完韭菜回家已是夜里11点多了。

    ⑨接下来，两位老人开始择韭菜，把两斤多韭菜择完、洗净后，差不多已经是凌晨了。

    ⑩接下来是擀饺子皮，然后包馅。这一切如果是在明亮的灯光下完成，不需要太长时间，但事实上他们都是在手电筒的光亮下完成的——两位老人怕开灯惊扰了儿子的好梦。

    ⑪这一切都做完是凌晨3点多，两位老人想了想，还有一会儿得煮饺子了，干脆别睡了，给儿子烧点儿热乎的水，这样，他一起来就有热水洗脸。

    ⑫5点30分，儿子的手机闹铃准时响了，儿子从睡梦中醒来，一睁开眼睛，便隐约闻到一股似曾相识的香味，这香味越来越浓，最后在厨房里达到了鼎盛——一大锅韭菜饺子在翻滚呢。

    ⑬看到儿子，母亲连连说：“娃快趁热吃了吧，你最喜欢的韭菜饺子，吃过再刷牙。”“是呀，先吃，先吃。”站在一旁的父亲帮母亲的腔，并立即将饺子盛进碗里，双手递到儿子的面前。

    ⑭儿子怎么也没有想到，自己随口说出的一句话，父亲和母亲就当真了，两位六十多岁的老人，竟然为了饺子一夜未眠。

    ⑮那是一碗滚烫的韭菜馅饺子，很香，很香，吃得儿子想哭。