https://breakingnewsenglish.com/2609/260910-birdsong-and-traffic-noise.html
Listening to birds singing has (1)______ positive effect on our mental health. Noise from traffic, however, is annoying and can increase our stress. A study from the University of Surrey suggests that traffic noise may reduce the good effects of birdsong (2)______ our mood.
Over 1,500 people (3)______(take) part in the study. They listened to nine sounds and then (4)______(ask) about how relaxed they felt. Birdsong was good for our health, but even at low levels, traffic noise caused a (5)______(lose) in well-being.
Dr Melissa Marselle said the world is noisy. "We need (6)______(understand) the impact of traffic noise," she said. She also suggested (7)______(lower) speed limits near parks. Traffic noise can be very (8)______(harm), she added.
Dr Eleanor Ratcliffe said we need to think more (9)______(careful) about adding green areas to towns. She said we should have quiet places so that people can enjoy (10)______ there.
词汇短语精讲
1. have a positive effect on 对…有积极影响
例句：Listening to birds singing has a positive effect on our mental health.
提示：have an effect on sth. 意为「对……有影响」，effect 前可加 positive/good/bad 等形容词；同类表达为 have an influence on
2. increase ... stress 增加…的压力
例句：Noise from traffic, however, is annoying and can increase our stress.
提示：increase 后接抽象名词，表示「使……增加」，如 increase stress / increase the risk；反义表达为 reduce stress（减轻压力）
3. take part in 参加，参与
例句：Over 1,500 people took part in the study.
提示：take part in 后接活动或事件（study / game / race）；与 join in 相比，take part in 更强调「在其中出力、扮演角色」
4. at low levels 在低水平上，处于低强度时
例句：Birdsong was good for our health, but even at low levels, traffic noise caused a loss in well-being.
提示：at ... levels 表示「在……的水平上」，可插入 even 强调让步，如 even at low levels（即使强度很低）；同类搭配 at high levels
5. lower speed limits 降低限速
例句：She also suggested lowering speed limits near parks.
提示：lower 作动词表示「降低」，speed limit 意为「限速」；同类搭配有 lower the price（降价）、lower the risk（降低风险）
句子精讲
1. She said we should have quiet places so that people can enjoy themselves there.
结构：主干 She said + 省略 that 的从句（we should have quiet places）；so that 引导目的状语从句 people can enjoy themselves there，说明「要有安静场所」是为了什么
语法：so that 引导的目的状语从句（表目的）
仿写：用 so that 引出做某事的目的：We should plant more trees so that the air gets cleaner. 注意 so that 后面接完整的句子。
2. Dr Melissa Marselle said the world is noisy.
结构：主干 Dr Melissa Marselle said + 省略 that 的宾语从句 the world is noisy。主句是过去时 said（引用她当时说的话），但从句陈述的「世界很吵」到现在仍然成立，所以从句的 be 动词用现在时 is，不跟着主句改成 was
语法：转述他人话语：sb. said (that) + 宾语从句；时态呼应——从句所述内容若现在仍然成立的客观事实，则用现在时，不移为过去时（常见错误：写成 said the world was noisy）
仿写：转述别人说过的话，从句所述若现在依然如此，就用现在时：Our teacher said reading widely is the best way to improve writing.（不能用 was）写作中引用他人观点、老师提醒、研究结论都可用这个句式开头。
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