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Câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 30 to 34
Arid regions in the southwestern United States have become increasingly inviting playgrounds for the growing number of recreation seekers who own vehicles such as motorcycles or powered trail bikes and indulge in hill-climbing contests or in carving new trails in the desert. But recent scientific studies show that these off-road vehicles can cause damage to desert landscapes that has long-range effects on the area's water-conserving characteristics and on the entire ecology, both plant and animal. Research by scientists in the western Mojave Desert in California revealed that the compaction of the sandy arid soil resulting from the passage of just one motorcycle markedly reduced the infiltration ability of the soil and created a stream of rain runoff water that eroded the hillside surface. In addition, the researchers discovered that the soil compaction caused by the off-road vehicles often killed native plant species and resulted in the invasion of different plant species within a few years. The native perennial species required many more years before they showed signs of returning. The scientists calculated that roughly a century would be required for the infiltration capacity of the Mojave soil to be restored after being compacted by vehicles.
What is the main topic of the passage?
A. Problems caused by recreational vehicles
B. Types of off-road vehicles
C. Plants of the southwestern desert
D. The increasing number of recreation seekers
Arid regions in the southwestern United States have become increasingly inviting playgrounds for the growing number of recreation seekers who own vehicles such as motorcycles or powered trail bikes and indulge in hill-climbing contests or in carving new trails in the desert. But recent scientific studies show that these off-road vehicles can cause damage to desert landscapes that has long-range effects on the area's water-conserving characteristics and on the entire ecology, both plant and animal. Research by scientists in the western Mojave Desert in California revealed that the compaction of the sandy arid soil resulting from the passage of just one motorcycle markedly reduced the infiltration ability of the soil and created a stream of rain runoff water that eroded the hillside surface. In addition, the researchers discovered that the soil compaction caused by the off-road vehicles often killed native plant species and resulted in the invasion of different plant species within a few years. The native perennial species required many more years before they showed signs of returning. The scientists calculated that roughly a century would be required for the infiltration capacity of the Mojave soil to be restored after being compacted by vehicles.
What is the main topic of the passage?
A. Problems caused by recreational vehicles
B. Types of off-road vehicles
C. Plants of the southwestern desert
D. The increasing number of recreation seekers
Kỹ năng: Đọc
Giải thích:
Chủ đề chính của đoạn văn là gì?
A. Những vấn đề gây ra bởi xe tiêu khiển
B. Các loại xe địa hình
C. Thực vật của vùng sa mạc phía Tây Nam
D. Ngày càng nhiều người tìm kiếm trò tiêu khiển
Thông tin ở đoạn: But recent scientific studies show that these off-road vehicles can cause damage to desert landscapes that has long-range effects on the area's waterconserving characteristics and on the entire ecology, both plant and animal
Nhưng các nghiên cứu khoa học gần đây cho thấy những chiếc xe địa hình này có thể gây ra thiệt hại cho cảnh quan sa mạc có ảnh hưởng lâu dài đến các đặc điểm bảo tồn nước của khu vực và trên toàn bộ hệ sinh thái, cả thực vật và động vật.
Giải thích:
Chủ đề chính của đoạn văn là gì?
A. Những vấn đề gây ra bởi xe tiêu khiển
B. Các loại xe địa hình
C. Thực vật của vùng sa mạc phía Tây Nam
D. Ngày càng nhiều người tìm kiếm trò tiêu khiển
Thông tin ở đoạn: But recent scientific studies show that these off-road vehicles can cause damage to desert landscapes that has long-range effects on the area's waterconserving characteristics and on the entire ecology, both plant and animal
Nhưng các nghiên cứu khoa học gần đây cho thấy những chiếc xe địa hình này có thể gây ra thiệt hại cho cảnh quan sa mạc có ảnh hưởng lâu dài đến các đặc điểm bảo tồn nước của khu vực và trên toàn bộ hệ sinh thái, cả thực vật và động vật.
Đáp án A.