These natural parks are important for preserving animals, which would ________ risk dying out.

A．merely

B．rather

C．otherwise

D．moreover

关于先天性肾盂输尿管交界处梗阻的原因，下列哪项是错误的

A．先天性狭窄

B．异位血管压迫

C．纤维束压迫

D．动力性梗阻

E．输尿管息肉梗阻