阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
It's easy to get defeated completely by something negative in your daily life.Give these apps a try if you want to be more positive instead of being negative in your daily life.
Shine
Shine is a text messaging service based on the idea that sometimes you need some external phrases to guide your internal positive thinking.
Visit the website，and you'll have the ability to sign up to receive a daily text message—all you need to provide is a first name and a phone number.Then you'll receive one message per day with inspirational quotes from successful people from Monday through Friday.
Kwippy
In many cases，statements that come from other people can be more powerful than ones you make to yourself.That's where Kwippy comes in.
The app Kwippy has a positive，lively community focused on fun while keeping negativity out.It is a new kind of social media platform that will send you random challenges throughout the day，prompting you to take a photo of something in your nearby environment.
ThinkUp
If you're feeling confident and good about your place in life，download the app，come up with some positive statements about yourself and record them for future generations.If you're feeling less creative or don't know what to say，don't worry—the app also has a list of shared positive statements that you can choose from.
Smiling Mind
Smiling Mind，a nonprofit organization，was founded by and is currently operated by psychologists and educators.Everything there is supported by scientific evidence.The app is free to use but you can make a donation if you want to continue supporting their efforts，displaying friendly and thoughtful acts to others.
In the app，you'll find different choices，which can help you remove negative thoughts and focus on the positivity of the present moments.
21．Which app makes people feel encouraged regularly?
A．Shine. B．Kwippy. C．ThinkUp. D．Smiling Mind.
22．Who is Kwippy suitable for?
A．Those who need to face a big life challenge.
B．Those who look for a friendly neighborhood.
C．Those who long for a great sense of belonging.
D．Those who want to live an enjoyable social life.
23．What is the purpose of the article?
A．To show the power of some advanced apps.
B．To introduce some apps for avoiding people feeling down.
C．To compare the advantages of some apps.
D．To list the wide usage of apps in our daily life.
