题目

对于空间任意一点O和不共线的三点A，B，C，有如下关系：，则( ) A．四点O，A，B，C必共面 B．四点P，A，B，C必共面 C．四点O，P，B，C必共面 D．五点O，P，A，B，C必共面 答案：B 解析：由已知得，而＋＋＝1，所以四点P，A，B，C共面．单词拼写（根据所给中文写出下列单词的正确形式；每小题1分，满分12分）1.They entered the area without __________ (许可）.2.He would ____________ (淹死）his sadness in coffee.3.Yonghui did not look happy but __________(怒视）at him.4.Perhaps we should combine our ideas and provide a _________(均衡的）menu.5.Come on, ____________(满足) my curiosity, what happened last night?6.We stood for a few moments, _______________(赞美；钦佩) the view.7.They see a ___________(一文不名的）young man wandering on the pavement.8.The fact is that I earned my ___________（船费）by working as an unpaid hand.9.The discovery of __________(重力) is so important for science.10.It was not so obvious that water was to be __________ (基本的）to the development of life.11.I cheered up immediately and floated _________(失重地） around in our spaceship cabin.12.For several ______ (十亿）years after the “Big Bang”, the earth was still just a cloud of dust.