| ai_content |
[{"id":1,"type":"choice",& [{"id":1,"type":"choice","question":"【长度单位换算】3 × 7 等于多少？","options":["A. 21","B. 24","C. 18","D. 27"],"answer":"A","explain":"3×7=21"},{"id":2,"type":"fill","question":"【长度单位换算】比100少35的数是___","answer":"65","explain":"100-35=65"},{"id":3,"type":"choice","question":"【长度单位换算】下列哪个是直角？","options":["A. 90°","B. 45°","C. 120°","D. 30°"],"answer":"A","explain":"直角=90°"},{"id":4,"type":"fill","question":"【长度单位换算】1米 = ___ 厘米","answer":"100","explain":"1米=100厘米"},{"id":5,"type":"choice","question":"【长度单位换算】小红8:30到校，11:00放学，在校几小时？","options":["A. 2.5小时","B. 3小时","C. 2小时","D. 3.5小时"],"answer":"A","explain":"11:00-8:30=2.5小时"},{"id":6,"type":"fill","question":"【长度单位换算】每支笔2元，买5支需要___元","answer":"10","explain":"2×5=10"},{"id":7,"type":"choice","question":"【长度单位换算】下面哪个分数等于1/2？","options":["A. 2/4","B. 1/3","C. 3/6","D. A和C"],"answer":"D","explain":"2/4=1/2, 3/6=1/2"},{"id":8,"type":"fill","question":"【长度单位换算】找规律：2, 4, 6, __, 10","answer":"8","explain":"每次+2"}]... |