30.有学者认为：“古代雅典政治建立在一种非常不民主的基础之上。” 下列雅典民主政治鼎盛时期的史实，可以支持该论断的是 A．公民大会是最高权
The poor man ate a big breakfast ___ he said he was not hungry. A. since B. because C. though D. for
已知复数则复数的虚部等于__________________
--- ______ you ever ______ aboard ?--- Yes, but only once. A． Do ,travel B．Have traveled C．Did travel D． Were traveling
《马关条约》是继《南京条约》以来最严重的不平等条约，这主要体现在 （ ）①割占领土最多 ②赔款数额空前巨大 ③开放口岸使列强更加侵
He made the choice to give all his money away, ______, he said, brought him happiness. A. it B. that C. which D. this
如图，PA切圆O于点A，割线PBC交圆O于点B、C，∠APC的角平分线分别与AB、AC相交于点D、E，求证： (1) AD＝AE； (2) AD2＝DB·EC.
现有固体试剂X：Zn粒、Cu粉、NaCl、MnO2；酸或碱溶液Y：浓H2SO4、浓HCl、氨水、NaOH溶液；盐溶液Z：AgNO3、KMnO4、KI、BaCl2。选择上述试剂做以下实验，根据现
