完形填空。 
   Hi! I am a Chinese boy. I'm from Shanghai. 1 name is Li Qiang. I’m thirteen years old. I'm in Yucai Middle School in Shanghai. I 2 a round face, a big nose, a small mouth 3 eyes. Michael is a new student 4 our school. He 5 the U.S.A. He is tall and he 6short black hair. He 7 cool. He is thirteen years old, too. He and 8 are in the same school but in different 9. My English is not good, and he often10 me. We are good friends now.

如图，在菱形ABCD中，AE⊥BC，E为垂足，若cosB=$\frac{4}{5}$，EC=2，P是AB边上的一个动点，则线段PE的长度的最小值是____ ．

根据课文默写古诗文。
①子曰：“               ，不亦君子乎？”(《论语》)
②枯藤老树昏鸦，小桥流水人家，                  。(马致远《秋思》)
③黄梅时节家家雨，青草池塘处处蛙，               ，                 。 (赵师秀《约客》)
④《三峡》中描写春冬之水清的句子是：               ，                 。
⑤请把孟浩然的《望洞庭湖赠张丞相》默写完整。
八月湖水平，涵虚混太清。                    ，                    。
                      ，                    。坐观垂钓者，徒有羡鱼情。

如图，点C为线段AB的中点，点D为线段AC的中点、已知AB=8，则BD=（　　）