2024届高考英语二轮阅读理解说明文 学案

The strategy for a research exposition I. Learning objectives: 1. Grasp the structure of research exposition. 2. Master the skills and tackle the questions based on the structure. 3. Know the testing points in the discussion and have a better understanding of the feelings conveyed by passages II. Teaching procedures Step 1 Reading for structure Task: Read the following passage and grasp the structure The Secret Language of Plants.(选必一unit 5) ①Talking plants have long been a thing of myths and legends. Many cultures have stories of talking trees that give advice as well as warnings to people. Alexander the Great and Marco Polo were said to have visited such a tree in India. And in some modern stories, such as the film Avatar, trees can communicate with animals and people. ②With us long believing that talking plants are fantasy, new research has revealed something amazing: it appears that plants can communicate after all. ③ It has been known for some time that plants use chemicals to communicate with each other. This happens when a plant, say a bean plant, gets attacked by insects. The plant releases tiny amounts of chemicals from the leaves that are being eaten. This is like a warning, or a call for help: “I'm being attacked!” When another bean plant detects the chemicals from its injured neighbour, it starts to release its own, different chemicals. Some of these chemicals drive insects away. Others attract insects - the wasps! The wasps kill the insects that are eating the bean plants. Scientists hope to learn more about this plant warning system, so that we can use it to grow crops without pesticides. ④ More surprisingly, plants also use sound to communicate. People can't hear these sounds, but plants are making them. Some plants make noises with their roots. Corn and chilli plants do this. They also “listen” to the noises from other plants. A chilli plant can tell if a neighbouring plant is helpful or unfriendly. Some trees mak