— Who is it? — ___________[ ]
A. It's a book.
B. This is a girl.
C. It's my book.
答案:B
法洛四联症的病理改变除外()
A.肺动脉狭窄
B.室间隔缺损
C.主动脉骑跨
D.左心室肥大
E.右心室肥大
如何才能写出高质量的教育科学研究报告