题目内容：

    In the year 2000, the world's population was about six billion. That's 6,000,000,000!

By 2025, scientists predict the world will have 7.8 billion people.（3） By 2050, there will be 9.1billion people.

People live on land. About one-third of the world is land. There are seven continents：Africa, Asia, Oceania, Europe, North America, South America and Antarctica. Antarctica is the world's coldest and the world's driest continent.

The world has four main oceans.（4）They are: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean and the Arctic Ocean. Oceans cover about three-quarters of the earth's surface.不是所有的陆地都适合人们。（5）Some land is too dry. The land is called desert. Deserts cover one-fifth of the earth's surface.

1.How many people were there in the word in 2000?______________________________________

2.Which continent do you live in?_____________________________________________________

3.把该句译成汉语。_______________________________________________________________

4.就画线部分提问，把该句改成特殊疑问句。_________________________________________

5.把该句译成英语。_______________________________________________________________