九年级（全）Units 7-8-【一战成名新中考】2024四川中考英语·教材主题语篇练优质课件PPT

九年级（全） Units 7~8 四川英语 英语 1 Ⅰ. 选择型阅读（2023丽水改编） Seagrass, an underwater plant that grows on the ocean floor, is very important for sea life. It also helps prevent global warming by storing carbon—a harmful gas. However, scientists don’t know exactly how much seagrass is at the bottom of the ocean. With the help of tiger sharks, a team of researchers has discovered the world’s largest meadow （grassland） on the seafloor near the Bahamas. 2 Seagrass meadows are home to many different kinds of fish, shellfish, and so on. Large sea animals, such as sharks, also spend a lot of time there looking for food. Seagrass can grow in very deep and dark water, making it difficult to find. But sharks can dive deep into the water and get to the areas people cannot reach. 3 After noticing tiger sharks swimming through seagrass off the Bahamas, an American scientist worked with a seagrass expert, trying to map the locations of the plants. The researchers fitted seven tiger sharks with cameras. Since tiger sharks swim in groups, they placed satellite tracking tag（卫星跟踪器） on eight other sharks to find out exactly where the animals swam. They collected hours of videos of the tiger sharks swimming through seagrass. 4 The researchers found more seagrass growing near the Bahamas than they expected—in fact, they believe that there is more seagrass there than anywhere else on Earth. The new finding increased the total number of seagrass known to exist by 41%. However, more research is needed to discover the true size of the seagrass meadow. 5 Scientists often depend on findings from divers and boats to study about the underwater world, but this team found that working with animals improved their understanding. They are now placing cameras on sea turtles to study seagrass in the Red Sea. Hopefully, more mysteries about seagrass will be solved. 6 【主旨大意】本文是一篇说明文。文章主要介绍了海草的重要性和科学家如何利用虎鲨进行海底研究，以及他们在巴哈马发现的世界最大的海草草地。这种创新的研究方法有助于增加人类对海底世界的了解。 1. What are the scientists studying acco