The official website of Beijing Municipal Education Commission has recently published a             reform plan to reduce the scores for English to 100 points from the current 150 points, _____ that is bound to cause an overwhelming stir across the country.

A．one

B．which

C．this

D．it

单侧输尿管积水的原因是（）

A.输尿管结石

B.输尿管狭窄

C.下腔静脉后输尿管

D.输尿管肿瘤

E.输尿管末端囊肿