There is an ongoing debate about the potentially ____(harm)effects that text messaging can have on people's grammar.
根据录音,判断句子是否正确。The monkey is smaller than the elephant.
已知图甲中的图象对应的函数y=f(x),则图乙中的图象对应的函数在下列给出的四式中只可能是( )
如图,平面直角坐标系中,OB在x轴上,∠ABO=90°,点A的坐标为(1,2),将△AOB绕点A逆时针旋转90°,点O的对应点C恰好落在双曲线y= kx (x>0)上,则k的值为( )