英語四級聽力真題對備考四級的重要性不言而喻，聽力在四級考試中的占比不小，同學們還需努力，盡量少丟分。以下是小編整理的關于2021年6月英語四級聽力真題(含音頻) 短文(1)的資料，希望對備考四級的同學們有所幫助！
Pigs are not native to North America. They were first introduced to California by Spanish and Russian explorers and settlers many centuries ago. In the early times, pigs were allowed to wander freely and search of food. This practice also allowed many pigs to escape from farms and live in the wild, which became a problem.
豬并非是美國的本土物種。多個世紀前，西班牙和俄羅斯的探險家和定居者首次將它們引入加利福尼亞州。早期，豬被允許自由游蕩和尋找食物。這種做法也讓許多豬逃離農(nóng)場，在野外生活，而這成為了問題。
In fact, as one of the most damaging invasive species on the continent, wild pigs caused millions of dollars in crop damage yearly. They also harbored dozens of diseases that threaten both humans and farm animals. Forest patches with wild pigs have been found to have considerably reduced plant and animal diversity.
事實上，作為非洲大陸最具破壞性的入侵物種之一，野豬每年造成數(shù)百萬美元的農(nóng)作物損失。它們還攜帶著數(shù)十種威脅人類和農(nóng)場動物的疾病。有野豬生活的森林斑塊被發(fā)現(xiàn)植物和動物多樣性大幅減少。
In addition to either eating other animals or their food supply, wild pigs damaged native habitats by reaching up crosses and rubbing on trees. Their activities may also create opportunities for invasive plants to colonize these areas. Wild pigs will eat almost anything containing calories. Mice, deer, birds, snakes and frogs are among their victims.
除了吃其他動物或它們的食物供應，野豬還通過雜交和在樹上摩擦來破壞當?shù)氐臈⒌?。它們的活動也可能為入侵植物在這些地區(qū)定居創(chuàng)造機會。野豬幾乎可以吃任何含熱量的食物。老鼠、鹿、鳥、蛇和青蛙都是受害者。
They can also harm other wild species through indirect competition rather than eating them or shrinking their food supply. On one particular United States island, wild pigs themselves became an attractive food source for a species of mainland eagle. Eagles began breeding on the island and also feeding on a species of native fox. The foxes were almost wiped out completely.
它們也可以通過間接競爭而不是吃掉或減少食物供應來傷害其他野生物種。在美國一座小島上，野豬本身就是一種大陸鷹的誘人食物來源。鷹開始在島上繁殖，它們也以一種本土狐貍為食。這導致狐貍幾乎被徹底消滅。
Questions 16 to 18 are based on the passage you have just heard.
請根據(jù)剛才所聽文章回答16至18題。
Q16. What do we learn about early pigs in North America?
問題16. 有關北美早期的豬，我們了解到了什么？
Q17. Why are wild pigs a threat to humans?
問題17. 為什么野豬對人類構成威脅？
Q18. What does the passage say about the native foxes on a U.S. island?
問題18. 這篇文章提到了美國一座島上本土狐貍的什么情況？
