题目

—Dad, do you know ______ now? —In Fort Middle School.  A. where is Betty studying            B. where Betty is studying  C. where did Betty study              D. where Betty studied 答案：B笔算（用竖式计算）512×3=394×8=618×6=706×4=2004×4=1300×7=235×7=649×5=5084×9=4207×5=．