题干
What's Tony going to do this Sunday?
A：See a movie．
B：Have a piano lesson．
C：Go to the zoo．
答案(点此获取答案解析）
B
What's Tony going to do this Sunday?
A：See a movie．
B：Have a piano lesson．
C：Go to the zoo．
的导函数是
，若
在原点处的切线方程为 （ ）