I was surprised ______little birds could eat ______ many insects in ______ a short time. [      ]

A. that so; so; such

B. that so; such; such

C. that such; so; so

D. that such; so; such

患者，女，54岁。一月前无明显诱因出现右手拇指屈伸活动受限，以后用力屈伸时出现疼痛，近2天拇指屈伸时出现弹跳动作，以晨起症状加重，活动一会儿后疼痛减轻

本病产生弹响的原因是（）。

A.屈肌腱与掌骨的摩擦所致

B.籽骨与屈肌腱的摩擦所致

C.腱系膜与屈肌腱的摩擦所致

D.病变肌腱的膨大部分通过狭窄的纤维管所致

E.软骨与屈肌腱摩擦所致