Lisa wants to _______ us her new pictures.
A:show
B:teach
C:draw
已知A(1,﹣2),B(a,﹣1),C(﹣b,0)三点共线,其中a>0,b>0,则ab的最大值是____
The volunteers a lot of help to the community for nearly ten years.
生活处处有物理,留心观察皆学问.对以下热现象解释不正确的是( )