-- Anna, could you lend me this book, please?
-- I'm sorry. I it for only two days, and I haven't finished it yet.
A:have bought
B:have had
C:bought
D:had
珠江三角洲与港澳地区合作的独特模式是 ( )
下面等式成立的是( )
写出下列字的部首。
间____ 奶____ 房____
(2015•内江)如图所示,是三峡船闸工作过程的示意图. 它是利用____原理来工作的.当阀门A打开,阀门B关闭,水从____流向下游,当它的水面与下游相平时,下游闸门A打开,船驶入闸室.