C2

例句：

1. 1. I need to use my computer to send this email.
   我需要用我的电脑发送这封电子邮件。
2. 2.The calculator is showing that the sum of 5 and 7 is 12.
   计算器显示5加7等于12。
3. 3.Computers are used for various purposes such as entertainment, education, and business.
   计算机被用于各种目的，如娱乐、教育和商业。