如图,四棱锥P﹣ABCD中,底面ABCD为矩形,PA⊥平面ABCD,E为PD的中点.
下列人类疾病中,由激素分泌异常引起的是( )
函数f(x)=2x﹣sinx的图像大致是( )
It's ________ you to sit there doing nothing at all while others are so busy.