若$a<b<0$,则下列不等式:①$\left|a\right|>\left|b\right|$;②$\frac{1}{a}>\frac{1}{b}$;③$\frac{a}{b}+\frac{b}{a}>2$;④$a^2<b^2$中,正确的有(     )

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Taking good notes is a time-saving skill that will help you to become a better student in several ways. ____ Second, your notes are excellent materials to refer to when you are studying for a test. Third, note-taking offers variety to your study time and helps you to hold your interest.

    You will want to take notes during classroom discussions and while reading a textbook or doing research for a report. ____ Whenever or however you take notes, keep in mind that note-taking is a selective process. ____

The following methods may work best for you.

●Read the text quickly to find the main facts and ideas in it.

●Carefully read the text and watch for words that can show main points and supporting facts.

●Write your notes in your own words.

●____

●Note any questions or ideas you may have about what was said or written.

    As you take notes, you may want to use your own shorthand(速记). When you do, be sure that you understand your symbols and that you use them all the time. ____

2014年3月1日晚，昆明火车站发生一起暴力恐怖袭击事件，造成29人遇难143人受伤。2014年5月22日，新疆乌鲁木齐又发生暴力恐怖袭击事件，造成31人遇难，90余人受伤。
5月25日，经中央批准，国家反恐工作领导小组决定，以新疆为主战场，其他省区市积极配合，开展为期一年的严厉打击暴力恐怖活动专项行动。

校园暴力，多数是以强凌弱，以大欺小，或拉帮结伙，以众欺寡。究其原因，或争风吃醋，或勒索钱物，或口角顶嘴，或嫉强妒能。更有甚者，校中小霸王认为“我看你不顺眼”便“给你颜色”看，横行霸道。作为一个有正义感的中学生，应该做到（    ）

①如果非正义的事情发生在自己身上，自己能够采用正当方式，奋起抗争

②如果看到非正义的事情发生在他人身上，能够见义智为、匡扶正义

③能及时对受害者给予声援和救助

④及时向老师、学校和有关部门报告，维护正义

【收集资料】通过阅读标签及查阅资料，她获得如下信息：

①该固体酒精中含有酒精、氯化钙、氢氧化钠三种物质；

②酒精的化学式为C₂H₅OH；

③氯化钙、氯化钡的水溶液均呈中性．

【提出问题】

①酒精的化学式与NaOH相比，都有“OH”，那么酒精的水溶液是不是显碱性？

②固体酒精中的氢氧化钠是否变质及变质的程度如何？