Try the new cleaner．Just a few minutes every day—that’s all it takes—______you could have shining floors and furniture．

A．and

B．but

C．or

D．so

山东盐税自（）初期，法定“青州、厥贡盐絺”开我国食盐贡税之先河。

A.夏

B.商

C.西周

D.春秋