健康的成年人终身具有造血功能的红骨髓位于（　　）

“他至死都认为他到了印度，但事实上他到达的是一块欧洲人从来都不知晓的新大陆”。这句话中的“他”是（   ）

倡导“低碳”生活，保护我们的环境．

（1）下列举措不能达到“低碳”目的是____ （填字母）．

A．提倡使用节能灯；                      B．利用和开发太阳能、风能等能源；

C．选择步行、骑自行车等方式出行；        D．广泛使用一次性筷子、一次性塑料袋．

（2）为减少二氧化碳等温室气体的排放，科学家采取“组合转化”技术，将二氧化碳和氢气在催化剂和加热条件下转化为一种重要的化工原料乙烯（C₂H₄）和水，该反应的化学方程式为　____ ．

（3）某地区有两种矿石储量丰富：①赤铁矿（主要成分是Fe₂O₃）②黄铁矿（主要成分是FeS₂），若从保护环境的角度考虑，炼铁厂应选用该地区的铁矿石是____ （填序号）．写出该铁矿石的主要成分与一氧化碳在高温条件下发生反应的化学方程式：____ ．

如图甲所示，用A、B两刻度尺测同一木块的边长，就分度值而言，____尺精密些，就使用方法而言，____尺不正确．

    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.'