诊断右心室扩大最有意义的是（）。
A.心电图
B.超声心动图检查
C.肺功能检查
D.剑突下心尖搏动
E.房室瓣听诊区杂音
参考答案：B
The disappearance of dinosaurs made _______ the evolution and dominance of mammals on the earth.
A．it was possible
B．it possible
C．possible to be
D．possible
反义RNA
