1 . COVID-19 shutdowns forced people out of work and pushed tens of millions into poverty worldwide. Governments tried hard to provide aid. It was easy in a small country, but difficult for a country with large population and vast rural areas.     1     Doing a detailed, nationwide, house-to-house survey takes people time and money. Luckily, satellites can see poverty from space.

Researchers have been finding ways to identify areas of wealth and poverty in satellite images. Through some satellite data and aerial images of one town or another, you can sort of tell whether it’s wealthy or not. Wealthier homes tend to have metal roofs while poor homes tend to have thatched roofs. Wealthier neighborhoods have paved roads and bigger plots of lands, more spaced out.     2     The researchers trained artificial intelligence (AI) to recognize these patterns.

    3     The researchers put AI to work studying patterns of mobile phone use in those regions. Rich people will make just more phone calls than poor people. They also might make more expensive international calls. They might use more mobile data because they have smartphones.     4    

The researchers use the system to identify about 60,000 people to receive benefits. The advantage of the satellite imagery and phone data approach is that it’s extremely fast and very convenient.     5     In shocks like climate disasters where there’s no time or way to get detailed information on the ground, satellites mobile phones and AI could help deliver aid quickly to people in need.

A．It was opposite in a big country.

B．How do they locate the neediest people?

C．So there’s a lot of information in the images.

D．Most importantly, it’s very cheap to carry out.

E．Worse still, it’s not so economical as a house-to-house survey.

F．However, in general, poorer people will just have feature phones.

G．What the researchers did next was to target the neediest people in those regions.

2 . The Most Populous Cities in the World

The cities listed below are the most populous (人口稠密的) in the world, according to a 2018 U. N. report.

Tokyo, Japan

Population in Urban Area: 37,340,000

Population in City Area: 13,960,000

Tokyo is the most populated city in the world and the largest “Megacity” in the world.

The city called the “Capital of the East” is located on the eastern coast of the Japanese main island of Honshu.

Delhi, India

Population in Urban Area: 31,181,000

Population in City Area: 20,591,874

Delhi, also known as the National Capital Territory of India is the largest city in the country. According to a U. N. report, the Indian capital is expected to be the spot of the world’s second most populous city through at least 2030.

Shanghai, China

Population in Urban Area: 27,796,000

Population in City Area: 22,315,474

This is China’s most populated and also wealthiest city. Situated in the Yangtze River Delta, in eastern China, it has a huge business district, two large airports (Pudong and Hongqiao) and the world’s fastest train (the Shanghai Maglev).

Sao Paulo, Brazil

Population in Urban Area: 22,043,028

Population in City Area: 10,021,295

This busy metropolis (大都市) in southeast Brazil, is the largest city of the Southern Hemisphere (半球) and the largest Portuguese-speaking city in the world.

1. How many people are there in City Area of Delhi?

A．10,021,295.

B．20,591,874.

C．22,315,474.

D．13,960,000.

2. Which of the following cities is the richest in its country?

A．Tokyo, Japan.

B．Delhi, India.

C．Shanghai, China.

D．Sao Paulo, Brazil.

3. What do the listed cities have in common?

A．They belong to the same hemisphere.

B．They are the largest cities in their countries.

C．They all have a larger population in their countries.

D．They are all the richest in their own countries.