题目

You look tired. I think you _____ lie down and rest. A. should      B. shouldn’t     C . will     D. won’t 答案：A12．如图，正方形ABCD-A1B1C1D1棱长为1，点E，F分别在直线AA1，BC上，若直线EF与棱C1D1相交，则|A1E|+|CF|的最小值是1．