绘出直方图后，如出现折齿型时，很可能是由（）造成的。
A.分组数据不当
B.原材料发生变化
C.数据收集不正常
D.临时他人顶班作业
参考答案：A
She couldn’t her words by the students even if she repeated them once again..
A．get…understanding
B．get…understood
C．get… to understand
D．make…understand
—Hello, what about you?
—Hello, Ms Li. My name is Li Daming and I’m ________ Beijing too.
A．for
B．of
C．behind
D．from
