—______do you like your birthday so much?

—I always have a party and get lots of presents. [     ]

A. How

B. What

C. Which

D. Why

橡胶软电缆供、馈电线路采用托缆安装方式，该结构两端的钢支架采用50mmx50mmx5mm角钢或槽钢焊制而成，并通过（）固定在桥架上。

A、底脚

B、钢管

C、角钢

D、扁铁