重点短语： 1. 彻底毁灭_________ 2. 终止，消灭 ____________ 3. 有记载的______ record 4. 尝试去做 _________ 5. 席卷 sweep _____ 6. 死于 (内因)____________死于（外因）______ 7. 对…有害 ______________ 8. the fall of the roman empire __________________________ 9. work together without pause _______________________10. become a cause for concern ____________________________ 11. a lack of basic health routine ________________12. do trails on… ________________________________ 13. spread in similar conditions ______________14. had no natural defences against… _______________
