A:发展高新产业,加快城市化进程
B:人口外迁,减轻环境压力
C:治水改土,改造低产田
D:抓好基础和生态环境建设
下列各句中,划线的成语使用恰当的一项是( )
—Can you lend me the book Passing by Your World?
—Sorry. I returned it to the library just now. Maybe it is still ________.
如图,在△ABC中,∠C=90°,点E是AC上的点,且∠1=∠2,DE垂直平分AB,垂足是D,如果EC=3cm,则AE等于( )