古诗文填空。

①《木兰诗》中“____，____”通过对夜晚清冷肃杀氛围的渲染，表现战地环境之艰苦，侧面烘托了木兰的勇敢坚毅。

②《酬乐天扬州初逢席上见赠》中运用典故表达作者对岁月流逝、人事变迁的感叹的句子是____，____。

③《论语》阐述读书求学问的三重境界的句子是____，____。

④至若春和景明，____，____，____；____，____；____，____。____，____，____，____，____，____！

    A new word is becoming more and more popular on the Internet in China - but no one knows quite what it means. The word "duang" is so new that you can't even find it in the Chinese dictionary. But it has already spread(传播) like fire on the Chinese Internet, appearing more than 8,000,000 times on Weibo, where 15,000 users had more than 312,000 discussions. On Baidu, it has been looked up almost 600,000 times. But what does it mean?

    "Everyone's duang-ing and I still don't know what it means! Looks like I'd better go back to school now," said Weibo user Fahmida.

    Another user asked: "Have you duang-ed today? My mind is full of duang duang duang."

    "To duang or not to duang, that is the question," wrote user Beatrice.

    "Duang" seems to be imitating (模仿) a sound. It all seems to have started with Hong Kong action star Jackie Chan, who in 2004 appeared in a shampoo ad (洗发水广告) where he used the sound "duang" to describe his soft and black hair. The word came to people again recently(最近) after Chan posted it on his Weibo page. Thousands of users then began to visit Chan's Weibo page with comments (评论).

    The word seems to have many different meanings, and there's no perfect (完美的) Chinese meaning for it, but you could use it to give emphasis (强调) to the word that follows it. A kid might be "duang cute", for example.

下列各句中，没有语病的一一句是 （   ）