肾实质部孤立性球形无回声区，壁薄，光滑，后壁回声增强（）
A.肾囊肿
B.多囊肾
C.肾积水
D.肾结石
E.肾癌
参考答案：A
After __ the luggage at the railway station,we left for the exhibition hall in a taxi. [ ]
A. claiming
B. demanding
C. deserving
D. obtaining
营业网点审批单位账户支取现金的审批权限是（）万元。
A.10
B.20
C.50
D.100
