A:He
B:Her
C:His
It's important for us to protect nature because we ______ its rich resources to live.
如图是人体部分腺体及其分泌物的作用示意图,下列分析不正确的是( )
已知抛物线y2=4px(p>0)与双曲线x2a2-y2b2=1a>0,b>0有相同的焦点F,点A是两曲线的交点,且AF⊥x轴,则双曲线的离心率为( )
— Remember to take a map with you.
— OK. I don't _______.