Indeed a lot of skillful methods are used in many advertisements to cheat consumers. Not all ads play tricks on us__________.
A：instead
B：though
C：still
D：anyway
由活性炭制成的冰箱除味剂是利用了活性炭的 ____作用．本炭使集气瓶中红标色的二氧化氮消失的变化是 ____变化．
我国延续两千多年的封建君主制度和封建剥削土地制度分别终结于 ( )
