Every evening Mr. King takes a _________ to his home . A. 25 minutes’ walkB. 25 minute’s walk C. 25 minute walkD.
I'll = I will;you'll = you will。she'll = she will;he'll = he will。we'll = we will;they'll = they will。I'd = I would;you'd = you would。she'd = she would;he'd = he would。we'd = we would;they'd = they would。例句。1、I'll see you tomorrow. = I will see you tomorrow.
第21天1.permit [pəˈmɪt]v,(permitted,permitted,permitting) 许可，允许 n.许可证，执照2.court [kɔ:t]n.法庭，法院；球场3.youth [ju:θ]n.青春；青年4.
也就是引起变化的原因，求导的过程就是寻找引起变化的原因。要想知道原因就要对其导数，那么我们选出那么路程任意点A求导，可以看出A点的切线比较陡，我们知道是路程s对时间t求导是速度v，也就说在那么路程的速度比较大。
