-Clark, your room is really in a mess, It needs ____
-Sorry , mum . I’ll do it at once
A:clean
B:cleaned
C:to clean
D:to be cleaned
若函数f(x)=4sin(ωx+φ)对任意的x都有f(π3+x)=f(-x),则f(π6)=( )
少数民族歌唱家才旦卓玛在《翻身农奴把歌唱》中唱到:“毛主席呀红太阳,救星就是共产党。翻身农奴把歌唱,幸福的歌声传四方。”才旦卓玛主要赞颂的是( )