题目

如图,点A、B、C的坐标为（0,3）、（2,1）、（2，-3），则△ABC的外心坐标是_________。 答案：（-2，-1）解析:略2、M：Uh, Professor Douglas, I saw a notice on the bulletin board about your ski cabin rental. Is it still （1） a___________? W：Yes. Which days are you interested in? M：We’d like to go this Friday and Saturday, if （2） p___________. If not, the following （3） w___________ is fine too. W：Let me see , one couple is there now, but they’re going to be （4） l___________ on Thursday of this week, so it （5） s___________ be fine on Friday and Saturday. M：We have six people in all. Is that OK? Do you have room for that many? W：Sure. There are two bedrooms and a pull-out bed in the （6） l___________ room, so it can sleep six. M：Thank you very much. By the way, how much should we pay? W：It’s 100 dollars for the weekend. M：You mean 100 dollars for six of us for two （7） n___________？That sounds great. W：Good. The price is （8） l___________ because we expect you to clean up the cabin before you leave. Can you come by my office tomorrow for the key and （9） i___________? My office hours are two to three p.m. M：All right. By the way, Professor Douglas, could you also show me how to get up to the cabin? I’m bring a （10） m___________ with me tomorrow. W：Of course. Actually I’ve already drawn a map that I’ll give you when I give you the key and instructions. M：Great. Thank you very much. I’ll see you tomorrow.