Today in our environmental science lecture, we're discussing the impact of urban development on local ecosystems. One key point is the loss of green spaces, which affects biodiversity. For example, a recent study in Manchester found that the number of bird species decreased by 20% over a decade due to new housing projects. However, the introduction of rooftop gardens in some areas helped to partially offset this decline, attracting insects and small birds again. So, while urban growth is inevitable, careful planning with green infrastructure can mitigate some negative effects.
❓ 曼彻斯特的研究揭示了住房项目的影响是什么？
A. A. 他们将鸟类物种数量增加了20%。
B. B. 它们导致十年间鸟类物种减少了20%。
C. C. 它们对当地生物多样性没有影响。
D. D. 它们促使了屋顶花园的引入。
✅ 正确答案
B. They caused a 20% decrease in bird species over ten years.