鸽子能帮我们对抗空气污染吗？这听起来令人难以置信，但一组来自伯明翰大学的学者对此坚信不疑。他们给这些鸟绑上传感器，和同样安装了传感器的无人机不同的是，鸽子可以不受限制地在繁忙的城市上空翱翔。由这些鸽子收集到的信息能帮助科学家模拟污染物在城市移动的模式，城市规划者也可以根据这些信息决定设立医院或学校的地点。

词汇 emissions

（有害气体）排放

far-fetched

难以置信的

练习 请从以下词汇中选择适当的答案来完成句子。注意：你可能需要改变单词的时态来完成句子。

emissions / far-fetched

1. A collapse in the use of coal has driven UK carbon ______ down to levels barely seen since the Victorian era, new figures show.

2. The idea of pigs producing human organs might sound a bit ______ but that is what a group of Japanese scientists is attempting to do.

答案 1. A collapse in the use of coal has driven UK carbon emissions down to levels barely seen since the Victorian era, new figures show.

2. The idea of pigs producing human organs might sound a bit far-fetched but that is what a group of Japanese scientists is attempting to do.

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