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Penguins are good swimmers, and they are very good at swimming in the sea. They can dive much deeper than people. Some people can dive about 180 metres, but most people can only dive about 30 metres. Penguins can dive 500 metres. That is a long way down! Do you know the TV Tower in Shanghai? That is 468 metres high.

 Penguins can hold their breath much longer than people.Some people can hold their breath for about five minutes, but most people can only hold their breath for one or two minutes. Penguins can hold their breath for 20 minutes.

Many whales can hold their breath longer than penguins. Some whales can hold their breath for about two hours!

如图是滑雪运动员从山上滑下的情景，下列说法中正确的是（　　）

材料一：管仲相桓公，霸诸侯，一匡天下。——《论语》

材料二：商鞅把小的乡邑合并为县，全国共设31县，由国君直接委派官吏治理；挖掉土地上原有的标志、疆界，向土地所有者征收赋税，保障国家的财政收入。变法五年后，秦国富强起来。

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