材料：人类要在月球活居住，首先离不开淡水和氧气，而月球上既没有水又没有空气。科学家发现月球的沙土中含有丰富的含氧钛铁矿，成分为TiO₂、Fe₂O₃的混合物,将这些矿石利用CO来还原提炼单质钛和铁,若用氢气还原，可以得到淡水。将这些矿石通电，还可以从中分离出氧气。

①、月球土壤中存在天然的铁、金、银、等多种金属矿物颗粒。若从铁、金（Au）、银混合金属中回收某些金属，将混合金属放入足量的盐酸中充分反应，然后过滤，剩余的固体中可以回收得到的金属组合是                          （　　　）

A、Fe、   B、Au、Fe    C、Ag、Au  D、Fe、Ag

②、据科学家预测，月球的土壤中吸附着百万吨的氦（He-3），其原子核中质子数为2、中子数为1，每百吨氦（He-3）核聚变所释放的能量相当于目前人类一年消耗的能量。下列关于氦（He-3）元素的说法正确的是              （ ）

③、“嫦娥一号”发射的火箭推进器中装有液态肼（用A表示）和过氧化氢（H₂O₂），它们混合时的反应方程式为：2H₂O₂+A==N₂+4H₂O ，则肼（A）的化学式为（   ）                                     

A、N₂H₂        B、N₂H₄O₂    C、NH₂     D、N₂H₄

④、从铁生锈条件来分析，月球上铁制品    (填“易”或“不易”)生锈，原因是：

                                        。

⑤、现利用CO来还原TiO₂、Fe₂O₃的混合物提炼单质钛和铁，装置如图所示，试回答：

⑴ 写出A中发生反应化学方程式（任意一个）                               。

⑵用CO还原钛铁矿，生成钛和铁的混合物，可用简单的物理方法将两种物质分开                  。

⑶就实验操作顺序的问题两位同学出现了分歧。小月认为先通一段时间CO排空，然后再点燃C和A中的酒精灯，小亮认为这样做不好，他的理由是                     ；

小亮认为先点燃C和A中的酒精灯，然后再通CO，小月又提出反对，她的理由是    

                老师认为他们的反对意见都有一定道理。请你帮助这两位同学解决他们的困难，你的办法是                                    

     Sydney is Australia's most exciting city. The history of Australia begins here. In 1788, Captain Arthur

Phillips arrived in Sydney with 11 ships and 1,024 passengers (including 770 prisoners) from Britain.

Today there are 2.5 million people in Sydney. It is the biggest city in Australia, and one of the most

beautiful cities in the world.

     There are over 20 fine beaches close to Sydney. Its warm summer climate and cool winter have made

it a favorite city for immigrants (移民) from overseas. There are three things that made Sydney famous-its beautiful harbor, the Sydney Harbor Bridge,and the Sydney Opera House.

But there are many more interesting things in Sydney: beautiful shops and restaurants, for example, rows

of interesting old houses built everywhere in the 19th century. Summer or winter, day or night, Sydney is

an outdoor city.

     Some Americans think it is very British. Some British visitors think it is like America. There is some

truth in both these opinions, because Sydney takes from both the Old World-Europe, and the New

World-America, and makes it into something that is neither British nor American but truly Australian.

1. Which of the following statements is true?

A. Sydney is a silent city.

B. Sydney is a busy city.

C. Sydney is a new city.

D. Sydney is a common city.

2. In 1788, Captain Arthur Phillips arrived in Sydney________.

A. with some ships and more than 1,000 passengers

B. with 11 ships and only 700 prisoners

C. with 1,024 passengers besides 700 prisoners

D. with only more than ten ships and some helpers

3. What made Sydney famous?

A. Three things-the beautiful harbor, the Sydney Harbor Bridge and the Sydney Opera House.

B. Immigrants from Britain, the beautiful Harbor and ships.

C. Beautiful shops, modern restaurants and interesting old houses and seas.

D. The Sydney Opera House, interesting old houses and interesting restaurants

4. The climate in Sydney is________.

A. hot in summer and cold in winter

B. warm all the year round

C. neither too hot nor too cold

D. cool all through the year

5. The writer thinks Sydney________.

A. is like America

B. is very British

C. is neither British nor American but truly Australian

D. takes from Europe