Li Hua's house is very far. She _____ the subway to school every day.     [ ]

A. takes

B. take

C. will take

D. by

某砌体承重结构沿纵墙两点A、B距离为L其沉降差为△s，则△s/L为（）。

A.沉降量 

B.沉降差 

C.倾斜 

D.局部倾斜