用Outlook接收电子邮件时，收到的邮件中带有回形针状标志，说明该邮件（）。
A、有病毒
B、有黑客
C、没有附件
D、有附件
参考答案：D
—China has set up Project Hope to help the children who can't afford to go to school.
—I think we should give away some money to______ this organization. [ ]
A. support
B. provide
C. establish
D. donate
社区环境可以分为哪几类？
