题目

Do you think __________ an English Evening tomorrow evening? A . there is B . there is going to have C . there is going to be D . there was 答案：C作∠AOB的平分线时,以O为圆心,某一长度为半径作弧,与OA,OB分别相交于点C,D,然后分别以点C,D为圆心,适当的长度为半径作弧,使两弧相交于一点,则这个适当的长度为(　　)A. 大于CD B. 等于CDC. 小于CD D. 以上答案都不对