Which online technologies cannot be used for improving writing teaching?( ) A: Wiki B: Online noticeboards and walls C: Computer games D: Forums

The two types of social e-commerce are , . A: based on social platforms such as forums and communities B: based on weak relationships C: based on WeChat and other self-media D: based on strong relationship

Which is NOT appropriate to do when receiving emails? A: To keep the email in private. B: To make sure if messages are misinterpreted. C: To use a license to post it in public forums. D: To remember that negative tone may be unintended.