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
The Internet makes your work or study more convenient and efficient，and there are many appsthat are beneficial both in your life and study．Below are some examples that you may find easy to download．
◆App Detox(Android)
To prevent you spending too much time browsing the web，App Detox blocks your access to the Internet or to apps of your choosing for a certain period of time to allow you to get things done without distractions．
Price: $3 per month
◆Studious(iOS)
Studious is an efficient homework planner that helps you achieve your maximum potential．You can input your class schedules in Studious，and it saves them and organizes them by their due dates in order to help you better be prepared for what’s up next．It can be set to remind you of when homework assignments are due and when your tests are approaching．
Price: $20 per year
◆Streaks(iOS and Android)
This award-winning app is an addicting goal-tracking app that challenges you to achieve a “victory”by tracking the number of continuous days you’ve stayed focused and completed specific tasks．It works well for goals like turning in homework on time or reading chapters in assigned books．
Price: Yearly Fee: $24
◆Remember the Milk(iOS and Android)
This is a smart to-do list app．You can create lists of things you need to accomplish on a specific day and organize these lists．The app breaks down all your tasks by the day，and organizes them the way you want to with priorities，due dates，repeats，lists and more．
Price: Monthly Fee: $4
21．Which app should you choose to break the Internet connection temporarily？
A．App Detox． B．Studious． C．Streaks． D．Remember the Milk．
22．What is the lowest annual cost to use one of the apps for Android？
A．$20． B．$24． C．$36． D．$48．
23．In which category can you find these apps？
A．Smart Finance． B．Developer Tools．
C．Time Management． D．Social Networking．
