氧元素是地壳中含量最高的元素，请回答下列问题

       不必说碧绿的菜畦，光滑的石井栏，高大的皂荚树，紫红的桑葚；也不必说鸣蝉在树叶里长吟，肥胖的黄蜂伏在菜花上，轻捷的叫天子（云雀）忽然从草间直窜向云霄里去了。单是周围的短短的泥墙根一带，就有无限趣味。油蛉在这里低唱，蟋蟀们在这里弹琴。翻开断砖来，有时会遇见蜈蚣；还有斑蝥，倘若用手指按住它的脊梁，便会啪的一声，从后窍喷出一阵烟雾。何首乌藤和木莲藤缠络着，木莲有莲房一般的果实，何首乌有臃肿的根。有人说，何首乌根是有像人形的，吃了便可以成仙，我于是常常拔它起来，牵连不断地拔起来，也曾因此弄坏了泥墙，却从来没有看见过有一块根像人样。如果不怕刺。还可以摘到覆盆子，像小珊瑚珠攒成的小球，又酸又甜，色味都比桑葚要好得远。

    Jack Ma is the founder and CEO of the alibaba.com,____ is the biggest e-commerce company in China. The website is an English-language site. It aims to offer suppliers and consumers____ direct means to communicate, and thereby save time and money ____ (efficient). This model of business ____ (refer) to as B2B (business to business), and it has attracted millions of users worldwide. On the back of this success. Jack Ma and his team developed Taobao in 2001. Today, alibaba.com is considered by many to be one of the best B2B____ (site), with over 7 million users____ (come) from more than 200 countries and religions. Jack Ma____ (become) the first Chinese businessman to appear on the cover of the famous magazine Forbes in the past 50 years. Jack Ma is respected by people not just because of his success, but also because of his____ (person). Although modest, Jack Ma is a very ____ (ambition) man. When asked about his future plan, he once said, 'I believe that in the next ten years, ____ the top three Internet companies in the world, one will be from China—and we want to be that company.'

—Look! There are two policemen.

—Yeah. They're walking      us.