听第二段对话,回答小题。
What is the boy going to do tomorrow afternoon?
A:Play basketball
B:play football.
C:Play volleyball.
Some damage has been caused u____ by people simply walking around the site and some has been caused deliberately.
下图为美国田纳西河流域示意图。完成以下问题。
已知如图,A是反比例函数y=kx的图象上的一点,AB丄x轴于点B,且△ABO的面积是3,则k的值是( )