题目

Emily and Alex were happy when their family moved to a house with a very big garden.They could climb up trees, grow flowers and even play badminton. They liked to watch the birds flying among the trees in the garden. They even started to put food out to attract more birds.Everything was fine for a few days until one afternoon there was a strange bumping noise on a window. Emily went outside and found a small bird dead on the grass. Its neck seemed to be broken.“It must have flown into the window,” Alex said when his sister Emily called him to have a look. “Ah, yes, look here. You can see如果点C是线段AB延长线上一点，且BC=AB，那么下列结论中正确的是A.B.C.D.