已知函数f(x)满足f(x+1)=-f(x)，且f(x)是偶函数，当$x\in 0,1$时， $f\left(x\right)=x^2$，若在区间-1,3内，函数g(x)=f(x)-kx-k有4个零点，则实数k的取值范围是（　　）

把手指放在喉结处，让我们从1数到10，声带____，发出声音。

填空。

①You mustn't walk around during landing. ____   A. On a bus

②You mustn't talk to the driver.____         B. On a train

③You must wear a helmet .____          C. On a bike

④You must wear a seatbelt.____           D. On a car

⑤You mustn't put your head out of the window.____   E. On a plane

⑥You must wear a lifejacket.____       F. On a boat

在方格纸上画出每个图形的另一半，使它成为一个轴对称图形．