左向右分流型先天性心脏病最多见并发症为（）
A.心律失常
B.肺炎
C.脑栓塞
D.感染性心内膜炎
E.喉返神经麻痹
参考答案：B
若x＜y，则x-2______y-2．（填“＜、＞或=”号）
Jessica has always been honest and straightforward, and it doesn’t matter ________ that she’s talking to.
A．who is it
B．who it is
C．it is who
D．it is whom
