Exercise 8. Read the text and choose the correct option. Erosion in America Erosion of America's farmland by wind and water has been a problem since settlers first put the prairies and grasslands under the plow in the nineteenth century. By the 1930s,(1) _______282 million acres of farmland (2)________ by erosion. After 40 years of (3)________ efforts, soil erosion has accelerated due to new demands (4) ________ on the land by heavy crop production. In the years ahead, soil erosion còn tiếp ----- Nội dung ảnh ----- và các vấn đề ô nhiễm mà nó gây ra có khả năng thay thế sự khan hiếm dầu mỏ như là vấn đề quan trọng nhất của quốc gia. vấn đề tài nguyên. 1. A. more than B. more C. less D. than 2. A. damaged B. was damaged C. were damaged D. damages 3. A. conserve B. conservation C. conserving D. conservations 4. A. were placed B. was placed C. which placed D. placed 5. A. nature B. natural C. nation D. national Hãy chọn đáp án đúng A, B, C hoặc D. Chúng rất được sợ hãi.
