高中外研社版必修三 Module4 Sandstorms in Asia单元检测解析版.docx

高中外研社版必修三 Module4 Sandstorms in Asia单元检测_1_ （2021·单元测试）Air and water p has become a major threaten to our environment. 【答案】pollution；ollution 【知识点】作主语、pollution （2021·单元测试）The US economy is facing a m crisis which has caused a series of social problems. 【答案】major；ajor 【知识点】作定语、major (a.)