十万个为什么·科学阅读30篇（3）

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为什么有些湖泊会随季节变换颜色？

Certain lakes turn pink, green, or red during warm summer months.
Tiny microbes called archaea and algae grow fast in salty, sunny water.
They make pigments like beta-carotene to protect themselves from strong sunlight.
Wind and rain mix the water, spreading color evenly across the lake surface.
In winter, cold temperatures slow growth and the lake looks clear or gray.
Scientists monitor these color shifts to track climate and ecosystem health.
One famous example is Lake Hillier in Australia — pink all year round.
The color is harmless and comes only from natural living organisms.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Certain lakes turn pink, green, or red during warm summer months. 某些湖泊在温暖的夏季会变成粉红、绿色或红色。
They make pigments like beta-carotene to protect themselves from strong sunlight. 它们产生β-胡萝卜素等色素，以抵御强烈的阳光。
Scientists monitor these color shifts to track climate and ecosystem health. 科学家通过监测这些变色现象来追踪气候变化和生态系统健康状况。

这篇中文题目最接近哪一句？为什么有些湖泊会随季节变换颜色？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？某些湖泊在温暖的夏季会变成粉红、绿色或红色。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Do Some Lakes Change Color Seasonally? How to cook noodles A maths worksheet

Certain lakes turn pink, green, or red during warm summer months.

Certain lakes turn pink, green, or red during warm summer months.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Certain lakes turn pink, green, or red during warm summer months.