中国陆地面积约960万平方千米,居世界第一位( )(判断对错)
(1)计算2(2+1)-8+43; (2)若a>1,化简1-a2-a2.
The robber hit and _______ Mr. Zhang and took away his wallet.
青蛙生殖过程中,不具有的是( )