完形填空

  It was very hot in the middle of summer and there were no trees 1the street. Mr. Read 2 his shop at half past five, and went 3 into the street and began walking to the bus stop. He was very 4. The sun shone straight down the street, and in a few minutes Mr. Read5very hot.

     A small boycame out of another6 in the street and 7Mr. Read. He stayed very8 him all the time, and he kicked Mr. Read's 9several times. Mr. Read looked at him 10 each time.

     After thefourth time, Mr. Read stopped, turned 11 and said to the small boy, "What are you doing? 12 following me like that! You're going to 13 my feet."

     "I'm 14, but don't stop me, please!" The small boy said, "It's very hot today, and there isn't 15shade anywhere else in the street."

已知函数$f\left(x\right)$的定义域为$R$，$f\left(x\right)=\left\{\begin{array}{c}x,0\le x\le 1,\\ {\left(\frac{1}{2}\right)}^x-1,-1\le x<0,\end{array}\right.$且对于任意的$x\in R$都有$f\left(x+1\right)=f\left(x-1\right)$，若在区间$-1,3$上函数$g\left(x\right)=f\left(x\right)-mx-m$恰有四个不同零点，则实数$m$的取值范围为(  )

共产党人在黄埔军校办学期间发挥了重要作用，表现为(    )
①孙中山亲自兼任总理②周恩来任政治部主任③一些中共党员任教官④军校培养出大批学员