The first TV was made by John Baird in 1925. It had one color. It could only show 30 lines. This was just enough room for a face. It didn’t work well, but it was a start.

【小题1】 It was in New York- Few people had TVs. The broadcasts were not meant to be watched. They showed a Felix the Cat doll for two hours a day. The doll spun around on a record player. They were experimenting. It took many years to get it right.

By the end of the 1930s, TVs were working well. America got its first taste at the 1939 Worlds Fair. 【小题2】 There were 200 small, black and white TVs set up around the fair. The U. S. President gave a speech over the TVs. The TVs were only five inches big but the people loved it.

By 1948 there were 4 big TV networks in America. They aired their shows from 8 to 11 each night. Local shows were aired at other times. 【小题3】 TV was not "always on" like it is now.

Color TVs came out in 1953. 【小题4】 Also, shows were aired in black and white. By 1965, color TVs were cheaper. TV stations started airing shows in color. People had to switch if they wanted to see the shows.

Now most TVs are high-def (高清). This means that they have many lines on them. 【小题5】 TVs have come a long way since Baird’s 30 line set. High-def TVs have 1080 lines. There are state of the art sets called 4K TVs. These TVs have 3,840 lines. Some people watch TV in 3D. I wonder what they will come up with next.

“To invent,” Thomas Edison said, “you need a good imagination and a pile of junk.”

Colrerd Nkosi had all the junk he needed, and the will to bring electricity to his small village in Malawi. As a result, he not only accomplished his goal, but won an award from the Queen of England. 【小题1】

In the beginning, he put a bicycle in the river and wondered how the current moved the pedals, and how it might be turned into power. Then he used an old refrigerator compressor(压缩机) to power six homes. 【小题2】 Finally, using a recycled corn- shelling machine motor and a fast-moving river, Nkosi created an electric turbine(涡轮机) that’s now lighting up homes in the town of Mzimba for free.

In a country where only 11%of the population has access to electricity, having a reliable and renewable source of energy has been a game- changer. 【小题3】

“In the past, we had to study by candlelight, and whenever there was no money to buy candles, we could not study,” student Gift Mfune said. “Now that we have access to electricity, many more of us will pass our exams.”

【小题4】 Indeed, the only charge for his service is a€1- per- month maintenance fee.

Over 2,000 people have benefited from his sustainable and locally generated electricity. And in 2018, Mr Nkosi won a Point of Light Award from Britain’s Queen Elizabeth II for his dedication to innovation.

In addition to lighting up his neighbors literally, Nkosi’s dream is to bring light to them as well through education. 【小题5】 He also hopes to expand his own skillset with more advanced studies.

Football is so popular in China. Almost everyone is interested in the sport — young and old, boys and girls, and now even robots.

Last week at Hangzhou Guangming Middle School, kids from several schools played football with their robots. Robot football was very different from human football.

Only two robots played in each match. The field was as big as a ping-pong table. One half was black and the other was white. Each robot tried to catch the “football”and score a goal. The robot with more goals won.

Gao Linge, a boy from Guangming Middle School, helped make one of the robots for the match.

“My school bought the main board (主板),” said Gao, 14. “Then I decided what my robot looked like and made a computer programme for it.”

Gao’s robot was eight centimeters tall and had two arms. It had four sensors (传感器) to “see” and “kick” the football.

Ying Xuehai, a 12-year-old student from Gao’s school, also made a robot. His robot played against Gao’s. The match decided who would go to the final game. Ying lost the game. So he gave many of his robot’s parts to Gao.

Even so, Gao’s robot didn’t win the final. It played well in the first five minutes. Then it slowed down. By the end of the match, it could hardly move.What was wrong? Gao and Ying found the problem — their robot ran out of batteries (电池)!

“We’ll solve the problem and beat the other school next time!” said the two boys.