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5A解析】物体在斜面上匀逸下清，印合力为0，物不文月学行向，渐体受三个力，重力分力、推力、滑动摩擦力，mgcos a=√(mgsin a)严干F,可得A。6B【解析】在绳子剪断醉间，弹簧由于形变没有瞬间变化，弹力不会突变，所以B球的加速度为0，A球的合力为绳子剪断前的拉力，F=2mg,选B。2大1。女出读到0，向方

One possible version:Dear David,I'm really excited to share with you a piece of good news.Our school is going to hold a photographyexhibition themed "Charming China"in the library next month,whose aim is to present the beauty of Chinathrough photos.I know you love photography,so why not send some of your photos of places or people in China thatimpress you most?The pictures can be of different sizes and must give people positive feelings.It's said thatyou've been to many places in China and have taken many pictures.You choose your favorite one and I am surevisitors will like your work.Finally,your work shall be sent to charmingphoto@sina.com before this Sunday.Looking forward to your early reply.Yours,