问题
填空题
如图所示，CD是线段AB的垂直平分线，D在AB上，则下列结论中正确的有______（填序号）
①AD=BD；②AC=BC；③∠A=∠B；④∠ACD=∠BCD；⑤∠ADC=∠BDC=90°．
答案
∵CD是线段AB的垂直平分线，∴AC=BC，AD=BD，∠A=∠B，∠ACD=∠BCD，且∠ADC=∠BDC=90°，
∴①②③④⑤都正确，故填①②③④⑤．
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如图所示，CD是线段AB的垂直平分线，D在AB上，则下列结论中正确的有______（填序号）
①AD=BD；②AC=BC；③∠A=∠B；④∠ACD=∠BCD；⑤∠ADC=∠BDC=90°．
∵CD是线段AB的垂直平分线，∴AC=BC，AD=BD，∠A=∠B，∠ACD=∠BCD，且∠ADC=∠BDC=90°，
∴①②③④⑤都正确，故填①②③④⑤．
It’s Saturday morning. Tony’s sitting at the kitchen table, staring into space and playing with a piece of bread. He’s not even 16 . Is he ill? No, but he does have a problem. He has nothing to do because the Internet is down. When he woke up this morning, Tony was feeling 17 . He jumped out of bed full of plans for the weekend ahead. It would be a weekend like any other great weekend. But that was 18 he turned on his computer and 19 he was unable to go online. Having no Internet changes everything. Every weekend, Tony will go online to email friends, read the news to 20 what’s happening in the world and play a few online chess games with his cousin Helen to kill time. The perfect weekend-online. Just as Tony is 21 how he can possibly have a normal weekend without the Internet, his mum walks into the 22 “Cheer up, Tony. Don’t think about the Internet any more, OK?” Tony makes no answer but sighs. “Go and play chess with Helen!” Tony’s mum 23 . “Oh, yes! Helen lives just around the corner. We can meet and play chess face to face for a 24 . Maybe this weekend won’t be so bad.” Tony 25 , as he walks to the phone. There is life beyond the Internet after all (毕竟).
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