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为什么某些地衣只生长在酸性岩石表面？

Lichens are symbiotic organisms made of fungi and algae or cyanobacteria.
They survive in extreme environments where few other plants can grow.
Some lichen species produce acids that slowly dissolve rock minerals to extract nutrients.
Acidic rocks like granite contain minerals such as quartz and feldspar that resist weathering.
These lichens thrive there because their acid secretion matches the rock’s low pH buffer capacity.
On alkaline limestone, the same acids react too strongly and inhibit growth.
Scientists measure lichen distribution to monitor long-term air quality and rock weathering rates.
Their slow growth—often less than one millimeter per year—makes them excellent environmental recorders.
Because they absorb everything from the air, they accumulate pollutants like heavy metals over decades.
This makes them natural bioindicators for ecological change across centuries.

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This makes them natural bioindicators for ecological change across centuries. 这使其成为跨越世纪的生态变化天然生物指示器。
Lichens are symbiotic organisms made of fungi and algae or cyanobacteria. 地衣是由真菌与藻类或蓝细菌组成的共生生物。
They survive in extreme environments where few other plants can grow. 它们能在其他植物难以生存的极端环境中存活。

这篇中文题目最接近哪一句？为什么某些地衣只生长在酸性岩石表面？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？地衣是由真菌与藻类或蓝细菌组成的共生生物。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 Certain Lichens Grow Only on Acidic Rock Surfaces? How to cook noodles A maths worksheet

This makes them natural bioindicators for ecological change across centuries.

This makes them natural bioindicators for ecological change across centuries.

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：This makes them natural bioindicators for ecological change across centuries.