第12题: [单项选择]A student had an average of 86 for three tests. If the student’s highest test score was 2a, what was the average of the student’s two lowest scores ?() A. 129-2a B. 258-2a C. 129-a D. 258+2a E. 258-a 参考答案:C
第16题: [单项选择]During the big fire in the school, Mantled ______ into groups and asked each group to carry buckets of water to throw an to the flame. A. dispersed B. organized C. scattered D. ordered 参考答案:B 答案解析:organize into 按照……组织;disperse 驱散、解散、疏散;scatter 使消散、使分散、使溃散;order 命令、点菜。