⑴How do you feel? ____                                 A. I can skip a rope.

⑵How does your grandfather feel? ____        B. My name is Jackson.

⑶What's your name? ____                              C. She's tired.

⑷How old are you? ____                                 D. I am tired.

⑸What can you do? ____                                E. I am eleven years old.

⑹How does Kitty feel?____                             F. He's tired.

设θ是第三象限角，且|cos$\frac{\theta }{2}$|＝－cos$\frac{\theta }{2}$，则$\frac{\theta }{2}$是(　　)

如图，在△ABC中，AB=AC，D为BC边上一点，∠B=30°，∠DAB=45°．

（1）求∠DAC的度数；
（2）请说明：AB=CD．