阅读下面两则文言文，完成问题。

     【甲】林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田美池桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。

（节选自《桃花源记》）

     【乙】大道之行也，天下为公，选贤与能，讲信修睦。故人不独亲其亲，不独子其子，使老有所终，壮有所用，幼有所长，矜、寡、孤、独、废疾者皆有所养，男有分，女有归。货恶其弃于地也，不必藏于己；力恶其不出于身也，不必为己。是故谋闭而不兴，盗窃乱贼而不作，故外户而不闲，是谓大同。

（选自《礼记•礼运》）

（1）将NaClO和NH₃按物质的量之比为1：2反应，可生产火箭发动机的一种优质燃料肼（N₂H₄），试写出反应的化学方程式：　____ 　，反应中____ 　是氧化产物．

（2）发射火箭时若以肼作燃料，一氧化二氮（N₂O）作氧化剂，两者反应生成对大气无污染、可参与大气循环的物质，写出反应的化学方程式：　____ ．

（3）N（NO₂）₃是科学家2011年发现的一种新型火箭推进剂的原料．下列有关说法正确的是____ ．

A．该物质只具有氧化性

B．该物质的摩尔质量是152

C.15.2g该物质含有6.02×10²³个原子

D．该物质既有氧化性又有还原性．

短文改错。

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号(^ )，并在其下面写出该加的词。 删除：把多余的词用(＼)划掉。修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。

    It is fine day today and I will never forget this special day. I was chosen to be a member of the football team and send to take part in the school football match. I was excited, but believed I would score most. But in the first round I hurt my leg and couldn't but to give up. I felt very sad. My best friend Tom comes up to me and said, “You are great! You still played for a few minute even after your leg hurt. You are a true winner.” I couldn't believe my ears. For me the one scoring the most is the winner. But Tom said, “The one which tries his best is the really winner.” Deeply impressing by his words, I want to say “thank you” to him.

物理老师的茶杯静止放在水平桌面上，则 (     )