5、(1)證明略。提示：證明△BCF≌△ABE即可。(2)GH=4。提示：作FB’⊥AB,GA’⊥BC,再證明△B’EF≌△A’GH即可。(3)①GH=8，②GH=4n。

　　第3節(jié)：英語園地

　　第①課：暑假計(jì)劃。(根據(jù)實(shí)際情況回答即可。)

　　第②課：生活英語

　　A.生活常用標(biāo)志：停車場(chǎng)Parking lot。麥當(dāng)勞Madonalds。小心碰頭Watch your head。油漆未干Wet paite。

　　B.廣告語：雪碧Obey you thirst。百事可樂Ask for more。飄柔洗發(fā)水Start ahead。耐克運(yùn)動(dòng)鞋Just do it。示例：雀巢咖啡The taste is great。

　　C.品牌名稱：Robust精力充沛的、Safeguard保護(hù)、Nice好的;漂亮的、Incline喜愛、Raid襲擊、Giant巨人、Younger更年輕的、Nike勝利女神、Legend傳說、Lux勒克斯(照明單位)、Rejoice欣喜、Tide潮流。

　　D.公共英語標(biāo)志：Careful slip、Don't hand off the flowers and trees、Visitors please tegister、Don't keep off thearass、Please shout the door after you、No littering。示例：①No smoking禁止吸煙②Safe exit安全出口③Quiet please禁止喧嘩。

　　E.壯麗山河：1、泰山，青天河，伊犁河谷(答案不唯一)2、Mount Tianzi表達(dá)方式：描寫。3、I want to go to Tibet,I hope that feel purn,beautiful,holy in there.

　　F.美麗家鄉(xiāng)：My hometown although in the countryside, but that didn't the noise and the fast pace of life. Said the Spring Festival, we will think of adopting, previously, we in the garden of a pond, have a rockery, false the mountains have a clump of grass, wehave the Spring Festival when often false the mountains to throw cannon, sometimes we will make practical joke, put the peng bacillus subtilis, light, the light of fire unto the midst of heaven, others will think and caught on fire!