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单选题
What happens because of the traditional fire-fighting practices in the USA?
A
There are fewer wildfires.
B
Trees and grass become thicker.
C
The weather becomes warmer and drier.
D
Sunlight reaches the ground to help forests.
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参考解析
解析：
细节理解题。文章第三段提到美国传统的消防方式能很快地将火扑灭，使得很多森林没有被烧毁，植被茂密，保存完好。所以，此题的正确答案为B项。
细节理解题。文章第三段提到美国传统的消防方式能很快地将火扑灭，使得很多森林没有被烧毁，植被茂密，保存完好。所以，此题的正确答案为B项。
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