于心脏黏液瘤，下列检查不能显示左房黏液瘤的大小及形状的是（）
A.CT
B.MRI
C.X线平片
D.X线心血管造影
E.超声心动图
参考答案：C
28. She had a computer at home, and her parents desired that she ______ all her work at home.
A．do
B．does
C．must do
D．would do
氮气脱氧床与（）床所使用的催化剂相同。
