2016年是孙中山先生诞生150周年。阅读材料，回答问题。

材料一：孙中山生平大事年代尺。

材料二：“十三岁随母到夏威夷岛，始见轮舟之奇，沧海之阔，自是有慕西学之心，穷天地之想。”“我们必须倾覆满洲政府，建设民国。革命成功之日，效法美国，选举总统，废除专制，实行共和。”（《孙中山全集》）

下列现象由于地球自转产生的是（    ）

类比实数的运算性质猜想复数的运算性质：

①“mn=nm”类比得到“z₁z₂=z₂z₁”；

②“|m•n|=|m|•|n|”类比得到“|z₁•z₂|=|z₁|•|z₂|”；

③“|x|=1⇒x=±1”类比得到“|z|=1⇒z=±1”

④“|x|²=x²”类比得到“|z|²=z²”

以上的式子中，类比得到的结论正确的个数是（   ）

    Even if you are naturally shy, these three tricks will help you to quickly build a new social circle in any new city.
1. Take pictures
    One of the great things about taking pictures at an event or a party is that it gives you an excuse to get in touch with the person later. Everybody loves seeing pictures of themselves, and it's very easy after taking a picture to say “If you'd like I can email it to you”. This can be the seed that leads to new connections.
2. Eat alone in public
    You might feel self-conscious eating by yourself but it has an important benefit: you are much easier to approach(接近) when you are alone. People may be afraid of disturbing you or being rude if you talk with someone else. Bring a book or newspaper to read. Plus, having an interesting book with you will give others an excuse tostart a conversation if they've read it.
3. Join a class, sports team, or club
    Yoga, salsa dancing, volleyball, Toastmasters (a public speaking club), a class for work, etc. Choose a new hobby or continue an old one!
These are all great places to meet new people, primarily because you will be made to see the same people over and over again in the class. You will automatically make friends with them if you have a common interest and are made to see each other again.