题目

在△ABC中，D为BC的中点，则=（+）将命题类比到空间：在三棱锥A﹣BCD中，G为△BCD的重心，则 =           ． 答案：=（++） 阅读短文，判断正误。 　　I started this QQ group named CZ(Chenzhou)English club two months ago．It has twenty-eight members now．It is an English chatting place．Now we need some more friends who are interested in chatting in English． 　　Please remember the rules for our group members． 　　★ Everyone in our group must speak in English with each other．Don't keep silent for ten days． 　　★ The main aim of this group is to improve our English． 　　★ Chatting in English doesn't mean we pay more attention to English．I think Chinese is my first language and it's the most important． 　　★ Don't send advertisements or any pictures here． 　　If you don't follow the rules above, we will ask you to leave． (1) This QQ group is an English chatting place． (　　) (2) Everyone in this group must speak in Chinese with each other． (　　) (3) The main aim of this QQ group is to make friends． (　　) (4) The writer thinks English is more important than Chinese． (　　) (5) If you send advertisements or any pictures here, you will have to leave． (　　)