一个四边形ABCD，若∠A：∠B：∠C：∠D=2：2：1：3，则这个四边形是__

John’s family is going on vacation next week. They are renting a house in the mountains for a week. John plans to hike and go bike riding there. And he is going to the mountains on Monday, and coming home on Friday. He is having a party on Saturday night. John’s mother is going on Monday, too. She is staying for a week and coming home on Sunday. She plans to take walks with her family in the beautiful countryside. John’s father is working on Monday and Tuesday, so he can’t be in the mountains then. He is going on Wednesday morning. He plans to go fishing, and he is coming home with John’s mother. John’s sister is staying at home. She is taking classes this summer and visiting friends.

People	Time in the mountains	Activities
John	Monday to   51	Go hiking and go bike riding.
John’s mother	Monday to Sunday	52
John’s father	53  to Sunday	54
55	(She isn’t going there)	Stay at home and take classes