杞人忧天

    杞国有人忧天地崩坠，身亡所寄，废寝食者。

    又有忧彼之所忧者，因往晓之，曰：“天，积气耳，亡处亡气。若屈伸呼吸，终日在天中行止，奈何忧崩坠乎？”

    其人曰：“天果积气，日月星宿，不当坠耶？”

    晓之者曰：“日月星宿，亦积气中之有光耀者，只使坠，亦不能有所中伤。”

    其人曰：“奈地坏何？”

    晓之者曰：“地，积块耳，充塞四虚，亡处亡块。若躇步跐蹈，终日在地上行止，奈何忧其坏？”

    其人舍然大喜，晚之者亦舍然大喜。

大力植树造林，可以改善气候的原因是（　　）
①蒸腾作用旺盛，使大气湿度增加　　　②呼吸作用旺盛，产生的水量增多　　　③光合作用旺盛，改善氧气与二氧化碳的平衡         ④可以保持水土，防风固沙

阅读理解

    The smart phone(智能手机)company Xiaomi Technology was set up in Beijing in 20 1 0.

Now it has become one of leading mobile phone companies in China. Some people skip work and school to wait in line to buy its main product:Mi phones.

    The man behind this craze(狂热)is Lei Jun. The 47-year-old is the co—founder(联合创始人) and CEO of Xiaomi. Lei was born in Xiantao, Hubei, in 1969. At the age of l 8. he entered Wuhan University to study computer science. A book that he read there changed his life. It was Fire n the Valley, which tells the story of the co—founder of Apple, Steve Jobs. Encouraged by the book. the 21—year—old set up a company. But it soon failed because he lacked(缺少)a long—trill plan.

After graduation, Lei joined King soft, a software company. In l 6 years, he became one of the top IT company leaders. But that's not the only thing he wanted. “I had my dream not realized and it was calling for me every night, ”said Lei. At the age of 38, he left Kingsoft and started his own company. This time, he knew what would make a promising new company:following the trends but keeping innovating(创新). He entered the smart phone market.

  Lei is a big fan of the iPhone. But instead of creating a copy of it, he kept thinking about how to make it better.

    At the age of 41, he co—founded Xiaomi. Now,  there are more than l4 million Mi phone users. Lei helped make online shopping popular in China. “People become great because they have dreams, ”said Lei.

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