仔细观察下面各式：

$\frac{1}{2\times 3}$=$\frac{1}{2}$﹣$\frac{1}{3}$, $\frac{1}{3\times 4}$=$\frac{1}{3}$﹣$\frac{1}{4}$ ,   $\frac{1}{4\times 5}$=$\frac{1}{4}$﹣$\frac{1}{5}$…

（1）请你根据其中的规律再写一道这样的算式：____ 

（2）运用这个规律计算：$\frac{1}{2\times 3}$+$\frac{1}{3\times 4}$+$\frac{1}{4\times 5}$+…+$\frac{1}{99\times 100}$=____ ．

绍兴的市花是兰花，关于构成一株兰花的结构层次由小到大的排列顺序，正确的是

小明在日记中写道：每次遇到一个难题，就苦思冥想，甚至睡不好觉；但是经过努力解决了，那种愉悦是不能言表的。他的这句话说明（    ）

2015•抚顺）如图所示，光线AO是通过凹透镜折射后射向水面的一条光线．请画出光线AO通过凹透镜前的入射光线、在水面的反射光线以及进入水中的折射光线的大致方向．

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SPECIAL EVENTS THIS WEEKEND

Captain Goodfellow

    Do your children enjoy interesting stories, funny games, and exciting dances? Captain Goodfellow will be ready to teach all these things to children of all ages at the City Theatres on Saturday morning at 10:00 . Free.

    Walking Tour of the Town

    Forget your worries on Saturday morning. Take a beautiful walk and learn about local history. Meet at the front entrance of City Hall at 9:30. Wear comfortable shoes!

    Films at the Museum

    Two European films will be shown on Saturday afternoon at the Museum Theatre. See Broken Window at 1:30. The workers will be at 3:45. For further information, call 4987898.

    International Picnic

    Are you tired of eating the same kind of food every day? Come to Central Park on Saturday and enjoy food from all over the world. Delicious and not expensive. Noon to 5:00 p.m.

    Take me out to the Ballgame

    It's October, and tonight is your last chance to see the Redbirds this year. Get your tickets at the gate. It might be cold. Don't forget sweaters and jackets.

    Do you want to hear “The Zoo”?

    “The Zoo”, a popular rock group from Australia, will give their first US concert this year tomorrow night at 8 Rose Hall, City College.