下列说法正确的是（   ）

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处错误，每句中最多有两处。错误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：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1、每处错误及其修改仅限一词；2、只允许修改10处，多者（从第11处起）不计分。
Dear editor，
    I'm sorry to occupy your precious time, and I really want to tell you anything about the problem of some people keeping too many pets nowadays. I take the problem more and more seriously for following reasons.
    First of all, as it is known to people, pets make so much noise that trouble residents a lot. What's more, it is widely accepted that animal waste pollutes the environment, where makes people quite uncomfortable. Many owners like taking their pets to public place where they may frighten children or even bite people. The mostly important is that pets can spread some diseases and this has attracted much attention.
    Take all these factors into consideration, I sincerely hope that I can get help from you and expect the media do something for this.
Yours truly'
Wang Lin

火星探测项目是我国继载人航天工程、嫦娥工程之后又一个重大太空探索项目，2018年左右我国将进行第一次火星探测．已知地球公转周期为T，到太阳的距离为R₁，运行速率为v₁，火星到太阳的距离为R₂，运行速率为v₂，太阳质量为M，引力常量为G．一个质量为m的探测器被发射到一围绕太阳的椭圆轨道上，以地球轨道上的A点为近日点，以火星轨道上的B点为远日点，如图所示．不计火星、地球对探测器的影响，则（   ）

已知$\omega >0$，函数$f\left(x\right)=\sin \left(\omega x+\frac{\mathrm{\pi }}{4}\right)$在$\left(\frac{\mathrm{\pi }}{2},\mathrm{\pi }\right)$上单调递减，则$\omega$取值范围是（    ）

下列叙述中的“一定”肯定成立的是（）
（1）爆炸一定是化学变化（2）化学变化中一定伴随着物理变化（3）有发光、放热现象发生的变化一定是化学变化（4）催化剂一定能加快化学反应速率（5）食盐溶解在水中得到食盐水一定是化合反应