内容正文:
Unit 22
I. 根据所给提示,用本单元所学词汇完成下面短文(每空一词)。
This year must be a 1. r________ year for both humans and animals. Hundreds of thousands
of people have lost their lives to coronavirus, and in the animal world full-blown extinction
continues to affect various species. The World Wildlife Fund (WWF) has warned that animal
populations have declined by an average of almost 70% in less than 50 years. Climate change,
human actions, 2. h________ loss and other factors have combined to leave many animals facing
a hopeless future — and some facing none at all. The river dolphin is one of them. River dolphins
are flagships for the health of the world's great rivers. However, they are extremely vulnerable (脆
弱 的 ) to the huge changes we are making to their environment. Despite major 3. c________
efforts and signs of progress, all the world's river dolphin species are now threatened with
extinction. It seems unlikely that they would go extinct next year, but some scientists already
consider them “functiona