完形填空
    In China, almost everyone knows Ma Yun. Ma Yun became one of1 men in China when his company Alibaba went on the stock（股票)market last year with a value of around £140 billion-the largest public offering in history.2 amazing thing it is! Here are some stories about him on the way to 3 .
    Ma made his4 trip to the US in 1995 and used the Internet 5 the first time. After 6 for "beer”, he saw that no results 7up about China. Then he searched for "China” and still saw no results. He decided to set up a Chinese website--the seed for Alibaba was sown(播种).Ma said he 8 many times in his life. He failed the College Entrance Examination in China three times and9 companies offered him jobs, including one at KFC. And he was refused by the famous Harvard University 10 times.
    Learning English was difficult when Ma was a teenager 10limited resources. However, he found that he could learn English well by giving tourists free guides around 11 hometown Hangzhou. And he kept it for nine years. Ma said that tourists opened up a new world for him because everything they said and did was so different from 12 he had been taught at school and by his parents.
    Ma's hero is Forrest Gump13never gives up. When he made a speech about his success at Davos(达沃斯论坛)in 2015,Ma said, "Life14 a box of chocolates because you never know what you are going to get.”15 as Ma does, never give up and you will be successful one day.

动物在生物圈中的作用有（  ）

①维持生态平衡

②促进生态系统的物质循环

③帮助植物传粉、传播种子．

文成公主和金城公主入藏，加强了汉族与哪个少数民族的友好往来（　　）

已知直线l⊥平面α，直线m⊂平面β，有下面四个命题：

（1）α∥β⇒l⊥m，（2）α⊥β⇒l∥m，

（3）l∥m⇒α⊥β，（4）l⊥m⇒α∥β，

其中正确命题是（　　）

有A、B、C三种溶液，A能使紫色石蕊试液变红，B能使无色酚酞试液变红，C遇紫色石蕊试液和无色酚酞试液均无变化，则三种溶液的pH由大到小的顺序是(    )