Shenzhen is a city in South China．It is not very big, but it has attracted people of the whole country and the whole world as well．

    Just about thirty years ago, it was only a small fishing village．There were not many people there． Most of them lived on fishing．Things have greatly changed since the 1980s．It became the first special economic zone(经济特区) in China．

    Because of the opening policy(政策), economic changes between China and the outside world have increased greatly．People can come and go easily between Shenzhen and Hong Kong．Both foreigners and Chinese have built a lot of factories, companies and tourists' attractions there．People all over the country have come to find jobs．Many of them have settled down in this new booming(兴起的) city．

    Shenzhen has been developing so fast that it has become a well－known metropolis(大都市) in China．

一个不透明的口袋中有三个完全相同的小球，把它们分别标号为1，2，3，随机摸出一个小球，然后放回，再随机摸出一个小球，两次摸出的小球标号的和为5的概率是（　　）

阅读《三峡》，完成下题。

三峡

郦道元

       自三峡七百里中，两岸连山，略无阙处。重岩叠嶂，隐天蔽日。自非亭午夜分，不见曦月。

       至于夏水襄陵，沿溯阻绝。或王命急宣，有时朝发白帝，暮到江陵，其间千二百里，虽乘奔御风，不以疾也。

       春冬之时，则素湍绿潭，回清倒影。绝巘多生怪柏，悬泉瀑布，飞漱其间，清荣峻茂，良多趣味。

       每至晴初霜旦，林寒涧肃，常有高猿长啸，属引凄异，空谷传响，哀转久绝。故渔者歌曰：“巴东三峡巫峡长，猿鸣三声泪沾裳！”

某天，老张一家五口围坐在一起，吃着“团圆饭”，聊着开心事。张大爷说：“我们钢铁公司是国有骨干企业，去年完成了一个投资近3亿元，能生产110万吨特种钢铁的项目。公司产值突破31亿，利税达到5.1亿。光年终奖金我就拿了5000元。”张大妈说：“我们那服装厂是个乡镇企业，去年引进了一套西服生产线，当年投产当年见效，光是税收就上缴了30多万。嘿，我还拿了2000元红包。”儿子张丰说：“我开了一家电脑公司，仅这几天就卖出去了20多台电脑。呵呵，这日子过得美滋滋的。”儿媳妇王芳说：“还说呢，我都快累死了。这那个美容院生意好得不得了，请了6个人做事，还是忙得不可开交。年初二还有十几个新娘等着给她们化妆。咳，看来，我是没法跟你们出去旅游了。”这时，孙子张宁拿来了计算器，嚷着要算算大家一年来的收入。不一会儿，他惊叫起来：“哇，我们家是30万元户了！这回，该买辆小轿车了吧？”大家听了，不禁开心地大笑起来 。

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