对尿素通透性最高的部位是
A．髓袢升支细段
B．髓袢升支粗段
C．集合管皮质部
D．集合管髓质部
参考答案：D
解析：对尿素通透性最高的部位是集合管髓质部。
简述注册税务师对房产税代理纳税审查操作要点。
Helen always helps her mother even though going to work ____ most of her day.
[ ]
A. takes up
B. makes up
C. saves up
D. puts up
