古往今来,不同的政权组织形式体现了人类政治文明的多样性。阅读材料,回答问题。 材料一 从独相到群相再到兼相,致使相权逐渐削弱,这既是我
已知函数f(x)是定义在R上的奇函数,当x≥0时,f(x)=(|x-a2|+|x-2a2|-3a2).若∀x∈R,f(x-1)≤f(x),则实数a的取值范围为( )
下图甲表示动物体生命活动调节的部分过程,图中字母代表激素;图乙表示的是运动神经纤维末梢和骨骼肌细胞之间的联系。请据图回答: (1)在寒
--- My son is two years old, but he can _________ draw. ---How clever! A. teach himself to B. teach to himself C. learn by himself
(08·全国ⅡB篇) The Queen’s English is now sounding less upper-class,a scientific study of the Queen’s Christmas broadcasts has found.Researchers have studied each of her messages to the C
在平面直角坐标系中,点集 则: (1)点集所表示的区域的面积为 。 (2)点集所表示的区 域的面积
如图,在Rt△ABC中,∠ABC=90°,AB=CB,以AB为直径的⊙O交AC于点D,点E是AB边上一点(点E不与点A、B重合),DE的延长线交⊙O于点G,DF⊥DG,且交BC于点F.
The final exam is a battle _______ everybody wants to show off his or her talent. A. that B. what C. where D. when