美国南北战争取得的最重要成果是( )A．赢得国家独立 B．废除黑人奴隶制C．维护国家统一
Jane Gooddall first made friends with a chimp（黑猩猩）when she was one year old．On her first birthday her mother carried her to the zoo near her home and bought her a toy chimp．She loved her
The police officer stopped us and asked us where . A. were we going B. we were going C. are we going D. we are going
生物多样性是人类赖以生存和发展的基础。下列关于生物多样性的说法错误的是( ) A．模拟苍蝇后翅平衡棒原理，研制出的新型导航仪是利用生物多样
右下图为花的基本结构图，请在横线上填写文字 （1）花的主要结构有雌蕊和雄蕊，其中雌蕊包括 [ I ] 、 [ H ] 、 [ E ]
It was in the village _____ he once lived _____ he got his junior education. A. that; where B. where; that C. which; where D. where; which
关于细胞分化、癌变、衰老的叙述，正确的是（ ） A.分化是细胞在形态结构功能和核遗传物质等各方面出现稳定性差异的过程 B.头发变白的原因是
如果函数y=（a﹣1）x2+3x+的图象经过平面直角坐标系的四个象限，那么a的取值范围是 ．
＝ . 