阅读短文，回答问题。
In the time it takes you to read this sentence, the population of the world will have grown by ten people. That
may not sound much, but it is 9,000 people in an hour, 1.5 million a week, or 79 million a year. That is the same
as adding most of the population of Germany to the world every year.
Most of these new people were born in developing countries. These countries are found in much of Africa,
South America and parts of Asia. In the developed countries of Europe and North America, the population is
growing very slowly. This is because women in these countries have, on average, only one or two children. In
the developing countries, many women have five or more children. In 1950, around one quarter of the world's
population lived in the developed countries. By 2050, these countries will be home to only around one tenth of
the world's people.
In the developing countries, more than one billion people already live below the poverty (贫困) line. These
people do not have enough food to eat and they live in poor housing; children get little or no time at school and
people suffer (遭受痛苦) from many kinds of diseases.
At the beginning of the 21st century, the world's population was around six billion people. The UN has said
that the world's population will level off at 12.5 billion people by the year 2100. Other groups think the world's
population will continue to grow, reaching 14 billion people before it becomes stable (稳定的), or even falls.
1. How many people are added to the world's population an hour?
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2. Developing countries can be found in what areas of the world?
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3. In 1950, what percentage (百分率) of the world's population lived in developing countries?
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4. What are examples that show people are living below the poverty line?
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5. There will be twelve and a half billion people on the earth in 2100 according to the UN, won't there?
