Unit 1词形转换专项练习-2021-2022学年人教版（2019）高中英语选择性必修第二册

Unit 1 Science and Scientists 核心词汇及词形转换 collect & sort: K.L. 1. We have collected enough proof to prove that you are the person who committed the crime. (prove) 2. The witness gave two contradictory statements, which clearly contradicted each other. (contradictory) 3. Your infection is caused by an infectious virus, which has infected a large number of people in a short time. (infect) 4. February witnessed a decrease of patients, decreasing to less than 1,000 cases each day. (decrease) 5. That city was severely polluted, but at first people there were not aware of its severity. (severe) 6. One failure after another frustrated the boy very much at first, but he didn’t seem to give in to those frustrations. (frustrate) 7. The price of gold depends upon its purity though it is completely pure. (pure) 8. The link between smoking and cancer has been made clear, but some people still doubt if they are linked to each other. (link) 9. The police suspected that the two suspects had fled out of their city. (suspect) 10. The instruction tells you how to use all the handles, so you’ll have no difficulty handling the machine. (handle) 11. To my thinking, it is not a good idea as it is thought to be. (think) 12. One of the main findings of the survey was that there were still people who found the situation not so serious. (find) 13. Solids turn to liquids at certain temperatures even if the lake is still frozen solid. (solid) 14. The doctor is sure that the initial situation is worse than he initially predicted. (initial) 15. He is a famous astronomer, who began to study astronomy when he was young. (astronomy) 16. We need skilled mechanics to approach these mechanical problems. (mechanic) 17. They were enthusiastic patriots, and their patriotic spirit inspired one generation after another. (patriot) 18. In his defence statement, they lawyer defended the innocent girl against an untrue crime. (defend) 19. Under the leadership of the wise leader, we were led to one success after