未知题型 An international conference on global warming will be held in Beijing in December this year. The organization committee is now looking for volunteers who can provide language service, computer aid and at least one week of working for the conference. Youre asked to write a letter to apply for this position. You should write about 100 words on ANSWER SHEET 2. Do not use your own name at the end of the notice. Use 'Li Ming' instead. Do not write your address.

判断题 中位数是一组数据的中间位置的数值。()

判断题 课堂问题行为的产生主要是由课堂内部因素引发的。()