《元日》中“新桃”与“旧符”指的是( )
A:春联
B:窗花
C:食物
打火机的燃料稍加压即可以液化,减压后(打开开关)液体又容易气化,遇明火即燃烧。上表中可做打火机燃料的是____
My parents asked me ______ my sister with her schoolwork.