题干
My little brother was ______，and I must look after the ______ baby.
A：sick; ill
B：ill; sick
C：ill; ill
D：sick; sicking
答案(点此获取答案解析）
B
My little brother was ______，and I must look after the ______ baby.
A：sick; ill
B：ill; sick
C：ill; ill
D：sick; sicking
中，D是BC边上任意一点（D与B，C不重合），且
，则