平衡反应评定属于（）
A.定性评定
B.定量评定
C.半定性评定
D.半定量评定
E.仪器评定
参考答案：A
I know little about the accident because not much ______ about it up to now.
A．has said
B．has been said
C．had said
D．had been said
乳腺恶性实质性肿块的超声表现，下列描述错误的是（）。
A.后壁回声清晰完整
B.内部回声不均匀
C.轮廓不规则，边缘粗糙
D.肿块后方多伴有声衰减
E.皮肤及周围组织被浸润
