19世纪末，有人说：“我国不可犹疑，与其座等邻邦之进步而与之共同复兴东亚，不如脱离其行伍，而与西洋各文明国家共进退。对待邻国之办法，不必因其为邻邦而稍有顾虑，只能按西洋人对此类国家之办法而对待之。”这段话作者的国籍应是

某实验室的废液中，可能含有FeCl₃、NaCl、Na₂SO₄、Ba(NO₃)₂中的一种或多种。某同学取该废液样品观察为无色溶液，向其中滴加BaCl₂溶液产生白色沉淀，继续加稀硝酸无明显现象。根据以上实验现象分析，下列推断正确的是

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　　At present, there is much homework for American students. But home is not a good place for students to do their homework. So there come Homework Clubs. And they are more and more popular in America.

What is the Homework Club?

The Homework Club is a good place for students to do their homework. It is very quiet. A teacher will help students prepare for the tests there. The teacher is not to teach students but to give them help when they need.

Where is the Homework Club?

The Homework Club is usually in a library or in a classroom. It is a popular activity after school every day. If there is no school that day, Homework Clubs will NOT meet.

What will students do in the Homework Club?

In the Homework Club, the students will do their homework for the first hour and then they will draw pictures or play football.

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爪哇岛上的M地被誉为“世界雷都”，位于熔岩高原北麓的山间盆地，海拔266米，一年约有322天打雷（雷电天气与地形、气象及所处纬度有关），200天下雨，生物资源丰富。下图为爪哇岛局部等高线地形图（单位：米）。M地比该岛其它地区打雷天气更多的原因是（    ）

已知函数$f\left(x\right)=\left\{\begin{array}{c}{x}^2+\frac{5}{2}x-3,x\ge -1\\ -\sqrt{1-{\left(x+2\right)}^2},-3\le x\le -1\end{array}\right.$,则函数$g\left(x\right)=f\left(x\right)-\frac{x}{2}$的零点个数为（  ）