Unit 3 单词练习-2022-2023学年高中英语北师大版（2019）选择性必修第一册

Word Study Unit 3 1. The p________ bags and packaging in supermarkets can take thousands of years to decompose, which pose a great threat to land and sea animals. 2. I never visit luxury shops because every single i________ on the shelves is more than I can afford. 3. There were m________ of dark clouds in the sky and they turned into a downpour shortly afterwards. 4. 2020 witnessed a significant d__________ in the birth rate of China, which means that the population is on the verge of falling down. 5. Human beings are taking advantage of r___________ materials like paper and metals in order to reduce waste and save energy. 6. The poster on the wall is not i__________ enough, so if you want more details just check it up on their official website. 7. Everyone is saying that human activities are t_________ the whole planet, but it is actually ourselves that we are putting in danger by destroying nature. 8. Houses with very good insulation(隔热) can help us c_________ energy, saving our money and promoting environment protection. 9. An unexpected fire d_________ everything he had, but luckily he still had his family which he valued most. 10. HIV/AIDS is a major t_________ to human health now because it can spread fast and has no effective cure. 11. Some TVs today look so high-tech that old people may have trouble finding where the s_________ are so they don’t know how to turn them on and off. 12. The rain forests are home to the numerous s_________ that form our biological diversity, some of which are still unknown to us. 13. U_________ things happened in this village: bubbles showed up in the wells and the animals got anxious late at night. 14. It is i________ to hunt animals that are protected by the law such as pandas and tigers. 15. All our plastic bottles should be r_________ so that there will be less of them ending up in landfills. 16. The travel agency should i_________ the visitors of the exact amount of money for the trip in advance so that they