已知下列命题：①对角线互相平分的四边形是平行四边形；②等腰梯形的对角线相等；③对角线互相垂直的四边形是菱形；．其中假命题有 ( ▲ )A．
如图，过A点的一次函数的图象与正比例函数y=2x的图象相交于点B，则这个一次函数的解析式是( ) A.y=2x+3 B.y=x-3
下列有关物质的性质或应用的说法正确的是 A．石油裂化可获得乙烯、丙烯和丁二烯 B．食醋的主要成分是醋酸，将一定量的醋酸溶液稀释，溶液中各
---Could you tell me_______？ ---At nine o'clock，in ten minutes． A．how will he leave B．when he has left C．why he is leaving D．when he will leave
化学与生活息息相关．下列过程主要发生化学变化的是（ ） A．淘米 B．洗菜 C．柠檬榨汁 D．葡萄酿酒
There are only 24 hours in a day，but people can use the time wisely. In other words，effective time management is important if you want to succeed. Knowing the importance of daily matters is the
古代先哲关于教育的论断，对于今天的教学活动仍然具有指导意义。我国古代教育家孔子将启发式教学概括为“不愤不启，不悱不发”。“愤者，心求
The eyes are the windows of the soul (心灵) . Having a pair of bright, clear eyes is very important, so we should protect our eyes throughout our lives. 9 Don’t read while lying
