请根据有关实验操作回答下列问题:
(1)用酒精灯火焰的外焰给试管内的液体加热,理由是____ ;
(2)做铁丝在氧气中燃烧实验时,在集气瓶中预先放少量水的目的是____ ;
(3)点燃可燃性气体之前,首先要进行的操作是____ ;
(4)测定酸性溶液的酸碱度时,预先湿润pH试纸,导致测得的结果____ (填“偏大”、“偏小”或“不变”).
根据短文内容,选择所给词的适当形式完成短文。
true put buy worry time
The most important person in the world is your mother. She looks after you all the ____ .On cold winter days, she always tells you ____on more clothes. She always stands in the wind waiting for you back from school every day. When you hurry to leave home for school without breakfast, she always feels ____ about you at home. She knows about your study and spends much money ____ your school things. Mother can do everything for you day after day. What ____ love that is in the world! We’ll always remember mother love.
阅读文言文,回答问题
唐雎不辱使命
秦王怫然怒,谓唐雎曰:“公亦尝闻天子之怒乎?”唐雎对曰:“臣未尝闻也。”秦王曰:“天子之怒,伏尸百万,流血千里。”唐雎曰:“大王尝闻布衣之怒乎?”秦王曰:“布衣之怒,亦免冠徒跣,以头抢地耳。”唐雎曰:“此庸夫之怒也,非士之怒也。夫专诸之刺王僚也,彗星袭月;聂政之刺韩傀也,白虹贯日;要离之刺庆忌也,仓鹰击于殿上。此三子者,皆布衣之士也,怀怒未发,休祲降于天,与臣而将四矣。若士必怒,伏尸二人,流血五步,天下缟素,今日是也。”挺剑而起。
秦王色挠,长跪而谢之曰:“先生坐!何至于此!寡人谕矣:夫韩、魏灭亡,而安陵以五十里之地存者,徒以有先生也。”
莫言说:“我的故乡高密有泥塑、剪纸、扑灰年画、茂腔等民间艺术,我从小耳濡目染。创作的时候,这些民间文化元素就进入了我的小说,甚至决定了作品的艺术风格。”这段话说明()