判断题 为了确定直线和真实数据的总误差，需要把所有误差的平方求和。()

未知题型 The investors judgment of the present stock returns seems to be______.A．fancifulB．pessimisticC．groundlessD．realistic

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.