某中学团委、学生会为了解该校学生最喜欢的球类活动的情况，对足球、乒乓球、篮球、排球四个项目作调查．并将调查的结果绘制成如下的两幅统计图（说明：每位同学只选一种自己最喜欢的球类），请你根据图中提供的信息解答下列问题：

（1）求这次接受调查的学生人数．并补全条形统计图；

（2）求扇形统计图中喜欢篮球的圆心角度数；

（3）从这次接受调查的学生中．随机抽查一个．恰好是最喜欢乒乓球的概率是多少？

如图，在矩形中，，，将矩形绕点顺时针旋转得到矩形

，则点经过的路径与， ，所围成封闭图形的面积是__________

（结果保留）.

如图1，在中，、、分别为三边的中点，点在边上，与四边形的周长相等，设、、．
（1）求线段的长；
（2）求证：平分；
（3）连接，如图2，若与相似，求证：．

如图，的半径为，是的内接等边三角形，点在圆上，四边形为矩形，这个矩形的面积是（    ）

A栏是五则寻找宠物的启事，B栏是七则宠物招领的启事。请根据左右两栏的信息帮助宠物的主人找到丢失的宠物。

A	B
(1) Animal LOST 5/23/2014     A black cat, old and thin. He's about 14 years old Our children have grown up with him and he is part of our family. If you see him, please call us right away.     Posted by: Debbie 6424111	a. I found a cat in my backyard around NW Street on May 11th, 2014. It's a small cat with white hairs and big green eyes. Please call Paul Smith at 9503341.
(2) Animal LOST 6/5/2014     Medium short haired, all black, about two years old, ears standing up, a very sweet dog.     Posted by: Kori 3480542	b. A wounded dog was found at the corner of my house at Millplain on April 30th, 2014. She has white front legs and big ears. Please call me at 9108846.
(3) Animal LOST 5/4/2014     A dog, 3 months old. She is brown with white hairs on her chest. Her eyes are greenish colored. Her nose is pink.     Posted by: Se nia 3405442	c. A white dog was found in our yard playing with our dog on March 23rd, 2014. She is a lovely big dog. There seems something wrong with one of her legs. Adamson at 8024156.
(4) Animal LOST 4/30/2014     1/2 Medium short haired, all black, about two years old. She has big ears and white chest with white front legs. She is a small dog and weighs about 6 pounds. One of her front legs got hurt, so she walks with difficulties.     Posted by: Jennifer Tomlinson 3607734	d. Our kids found a cat close to our house atSW Alexander Street. It's a black cat. It is old and thin. Please call Gordon at 7768585.
(5) Animal LOST 5/11/2014     Our pet is a small, medium white haired, 4-year-old cat. She has two big eyes and they are bright green.     Posted by: Lauren 2407131	e. A cat was found in my garden on April 30th, 2014. It's old and thin. Please call Jeff at 8034477.
	f. A baby dog was found around Kauffman Street. It's about 3-5 months old. She has green eyes and a pink nose. Please call Morrie at 9019968.
	g. I found a dog at Molalla Area on June 5th, 2014. It's a small black dog, about 2 years old. Please call Larry at 7058864.

已知，．
（Ⅰ）讨论的单调性；
（Ⅱ）当时，证明对于任意的成立．

阅读下列图文材料，回答问题。
    材料  2013年9月7日，中国国家主席习近平在哈萨克斯坦作重要演讲，提出共同建设“丝绸之路经济带”。

陜西、山西简图