如图，AB∥EF，CD⊥EF，∠BAC=50°，则∠ACD=（ ）
- Can you go swimming with us this afternoon?
- I'd love to, but I ____________ take care of my mother because she is ill.
乌贼遇敌害会释放墨汁，将周围海水染黑，借机逃跑．下列有关的描述不正确的是（ ）
