A:Yes, it is.
B:No, thanks.
一 Has she replied to your question?
— Not yet. She says she is busy at the moment.
如图,在方格纸中,△ABC经过变换得到△DEF,正确的变换是( )
人类有22对常染色体,1对性染色体,经减数分裂只产生两种组成不同的配子.( )
下面对《饮酒》这首诗赏析有误的一项是( )。