UNICEF reports that 40 million children below the age of 15 suffer from abuse(虐待) and neglect. The USA National Committee to Prevent Child Abuse finds 3 million new reports of child abuse or negle
如图，已知是椭圆 的左、右焦点， 点在椭圆上，线段与圆相切于点，且点为线段的中点，则椭圆的离心率为 ▲ ．
读我国东部某地区等高线图（单位：米），回答2题。 26．．图中G处最适宜开展的运动项目是 A．激流勇进 B．攀岩 C．跳水
画出图1-3-2中均匀球和均匀杆受到的弹力和重力. 图1-3-2
Three Boys and a Dad Brad closed the door slowly as Sue left home to visit her mother. Expecting a whole day to relax, he was thinking whether to read the newspaper or watch his favourite TV
【甲】 崇祯五年十二月，余住西湖。大雪三日，湖中人鸟声俱绝。是日更定矣，余挐一小舟，拥毳衣炉火，独往湖心亭看雪。雾凇沆砀，天与云与山与
设函数是定义在R上周期为3的奇函数，若，则有 A .且 B. 或 C. D.
（2011年湖北黄冈，12题，2分）下列各级物质的溶液不用其它试剂就可鉴别的是：A．HClCuCl2NaNO3 Na2SO4B．BaCl2 Na2CO3 HCl (NH4)2CO3C．FeCl3 HClNaClNaOHD．Na2CO3Na2SO4HCl
B．
C．
D．
