阅读下列短文，从每题所给的四个选项 (A、B、C、和D) 中，选出最佳选项，并在答题卡上将该项涂黑。
A
Smartphones can be a force for good. Your phone is always with you, making it the perfect device to push you into a more beneficial way of living. Here are some of the best apps that can help.
Habitica
Habitica turns the goal of forming good habits into a game, with its own characters and scoring. It's a lot of fun, and the app also lets you build habits with friends and family. In addition to regular repeating habits, you can add a more general to-do list, and the rewards you get can be customized too—you could treat yourself to a meal out or an extra hour of games.
Smoke free
If you're determined to give up smoking, Smoke Free is one of the most comprehensive apps for giving you that extra push you need to make a permanent change. The app offers a host of useful features to people wanting to go smoke-free: the ability to see your progress over time, charts showing how your health is improving, day-by-day encouragement, and some advice on techniques for giving up smoking.
My Fitness Pal
You can find tons of health and fitness apps for your phone, but My Fitness Pal stands out not just because it is easy to use, but because it makes practical suggestions for you. It can take in a host of data, from the calories you5re taking in to the number of swims you're doing per week, and offer reports on calorie consumption and macronutrient (大量营养素) breakdown.
21. What can Habitica help you to do?
A. Win a tough game. B. Start a lasting friendship.
C. Develop a pleasant habit. D. Find a fancy restaurant.
22. Which of the following can Smoke Free provide?
A. The freedom to smoke. B. The ability to make progress.
C. Charts about your excellent health. D. Advice on how to quit smoking.
23. What can we learn about the three apps mentioned in the text?
A. They' re practical. B. They' re cheap. C. They' re perfect. D. They' re free.
