辉帅LED照明
Killer whales, or orcas, are known for their severe 进入查看：2022-2023学年英语周报九年级第27期答案汇总 以下内容仅作展示，图片上方文字进入查看。 Killer whales, or orcas, are known for their severe attacks on sea animals but they have never posed a threat to humans. However, since late July, the normally social animals have been intentionally attacking sailboats off the coasts of Spain and Portugal. The strange behavior first surfaced on July 29, 2020, when a 46-foot boat was repeatedly attacked for almost an hour by nine orcas, causing the boat to rotate(旋转) 180 degrees and having its engine switched off. Since then, over 30 more similar incidents have been reported. On September 23, 2020, Spain's government banned boats of less than 50 feet in length from sailing in the 60-mile stretch of the Atlantic coastline between Ferrol and the Estaca de Bares Cape, where the attacks have been occurring. Researchers across the world are trying to explain the orcas' behavior. Some believe it could be a result of the overfishing of the bluefish tuna - the orcas' primary food source -which has left the area's killer whales starving and unable to feed their babies. "I saw them look at boats carrying fish. I think they know humans are somehow related to food shortages, "says Ken Balcomb, senior scientist at the Center for Whale Research in Washington, US A. The environmentalists believe the sudden increase in boat traffic and fishing activities, after months of absence due to restrictions on human activity last spring, could also be contributing to the agitation.
索邦大学
When he was 12 years old,he got his first job. 进入查看：2022-2023学年英语周报九年级第30期答案汇总 以下内容仅作展示，图片上方文字进入查看。 When he was 12 years old,he got his first job.He became a newsboy on a train.He did experiments on the train in his spare time.Unluckily,his first work experience did not end well.They fired him when he accidentally set fire to the floor of the train.Then Edison worked for five years as a telegraph operator,but he continued to spend much of his time in experimenting his first patent in 1868 for a vote recorder run by electricity. Thomas Edison was totally deaf in one ear and hard of hearing in the other,but he thought of his deafness as a blessing in many ways.It kept conversations short,so that he could have more time for work.He always worked 16 out of every 24 hours.Sometimes his wife had to remind him to sleep and eat. Thomas Edison died at the age of 84.He left a great many inventions that greatly improved the quality of life all over the world.
优质英语培训问答知识库
