建设中国特色社会主义的总任务是（　　）

【提出问题】三个有理数 $a,b,c$ 满足 $abc>0$ ，求 $\frac{\left|a\right|}{a}+\frac{\left|b\right|}{b}+\frac{\left|c\right|}{c}$ 的值.

【解决问题】解:由题意，得 $a,b,c$ 三个有理数都为正数或其中一个为正数，另两个为负数.

① $a,b,c$ 都是正数，即 $a>0,b>0,c>0$ 时，则 $\frac{\left|a\right|}{a}+\frac{\left|b\right|}{b}+\frac{\left|c\right|}{c}=\frac{a}{a}+\frac{b}{b}+\frac{c}{c}=1+1+1=3$ ;

②当 $a,b,c$ 中有一个为正数，另两个为负数时，不妨设 $a>0,b<0,c<0$ ，则 $\frac{\left|a\right|}{a}+\frac{\left|b\right|}{b}+\frac{\left|c\right|}{c}=\frac{a}{a}+\frac{-b}{b}+\frac{-c}{c}=1+\left(-1\right)+\left(-1\right)=-1$ .

综上所述， $\frac{\left|a\right|}{a}+\frac{\left|b\right|}{b}+\frac{\left|c\right|}{c}$ 值为3或-1.

【探究】请根据上面的解题思路解答下面的问题:

阅读下列短文，从下面每小题的A、B、C、D四个选项中选出最佳选项。

    What's it all about?

    OneSmallDeed.com is a website which lets the world know the good deeds（行动）they have done and to encourage others to do the same.

    Who are we?

    We are not a big organization, but just a group of people who wanted to find a way to make the world a nicer place. We live in London and come from different countries and cultures. The one thing we have in common is that we are kind and giving people who want to see more people like us.

    Want to join?

    All you need to do is just a small good deed as often as you can do. If you want to encourage others, then post your deeds on our website.

    Here are some suggestions for you to get started:

    1  Open the door for someone 

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    4  If someone in need, like a man in a wheelchair to get across the street, help them. 

    5  If you see someone crying, ask if you can help.

计算（x+3）（x﹣3）的结果是（　　）