The world's population will reach 9.7 billion by 2050 as India becomes the largest country, the UN has reported. In 35 years' time, there will be an extra 2.4 billion people in the world because of high fertility rates in a handful of countries. The UN predicts that the number will rise to 11.2 billion by 2100. 

Between 2015 and 2050, half of the growth will be concentrated in India, Nigeria, Pakistan, Democratic Republic of the Congo, Ethiopia, United Republic of Tanzania, United States of America, Indonesia and Uganda. India will surpass China as the country with the greatest population around 2022, and Nigeria is predicted to have more people than the United States by 2050. 

The number of people living in 28 African countries is also expected to double, and by 2100 several countries will see a fivefold increase in their population. Angola, Burundi, Democratic Republic of Congo, Malawi, Mali, Niger, Somalia, Uganda, United Republic of Tanzania and Zambia are all expected to see their populations grow by at least a factor of five.

Children under 15 years make up 41 per cent of the population in Africa, while those aged between 15 and 24 years make up a further 19 per cent.

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1.Which is the largest country in population by 2050?

A China.

B India.

C Russia.

D United States of America.

解析：选B。判断推理题。根据第一段第一句The world's population will reach 9.7 billion by 2050 as India becomes the largest country,…可知，故选B。

2.What’s the population in the world now?

A 9.7 billion.

B 2.4 billion.

C 7.3 billion.

D 11.2 billion.

解析：选C。数字计算题。根据第一段第一、二句The world's population will reach 9.7 billion by 2050 as India becomes the largest country, the UN has reported. In 35 years' time, there will be an extra 2.4 billion people in the world… 在35年内世界人口将增加24亿达到97亿可知目前人口为73亿，故选C。

3.The underlined word “surpass” means _______in Chinese.

A 通过

B 经过

C 超过

D 越过

解析：选C。词义猜测题。印度人口比中国人口多，应为“超过”，故选C。

4.The number of people living in 28 ______countries is expected to double.

A Asian.

B African.

C American.

D European.

解析：选B。细节理解题。根据第三段第一句The number of people living in 28 African countries is also expected to double,…可知，故选B。

5.This is a passage on______.

A economics.

B politics.

C health.

D population.

解析：选D。主旨大意题。文章主要讲世界人口问题，并未提到经济政治与健康方面，故选D。