如图，平行四边形ABCD的对角线交于点O，且AB=5，△OCD的周长为23，则平行四边形ABCD的两条对角线的和是（　　）

如图是“侵入我国的寒潮路径图”，下列地区受寒潮影响最大的是（   ）

计算$2\sqrt{48}÷\sqrt{6}$=____ ．

根据首字母或中文提示完成句子。
Tony likes talk show. But he can't s____ Chinese cooking.
Look! Tom and his family are l____ on the beach, they look happy.
We had great fun s____ in the river.
The pop singer w____ funny glasses is Johnny Dean.
I'm s____she can dance so well. She is only 7 years old.
——What e____ do you have to do?——We have to clean the classroom.
 On weekends, the shops are too c____, there are so many people in them .
——What's Lilei doing?—— He's w____ for the bus.Jenny is lazy, she n____does her homework at home.
Do you think everyone e____  their weekends?

曹刿冲破阻挠，坚持进见鲁庄公的原因是什么？____，____。