十万个为什么·科学阅读30篇（2）

30 / 30

已读 0 / 30 课

某些青蛙如何在整冬被完全冻成冰块后仍能存活？

Wood frogs stop breathing, halt heartbeats, and freeze up to 65% of their body water into ice crystals.
Special glucose proteins flood their blood, acting as natural antifreeze to protect cells from damage.
Ice forms only between cells—not inside them—preventing lethal ruptures during expansion.
Their metabolism drops to nearly zero, conserving energy until spring thaws trigger revival.
Enzymes responsible for DNA repair become highly active immediately after thawing begins.
Scientists identified cryoprotectant genes that activate only when temperatures fall below 0°C.
Frogs buried under leaf litter survive because snow insulates them from extreme cold swings.
This adaptation lets them inhabit colder regions than most amphibians can tolerate.
Biomedical researchers study these frogs to improve human organ preservation techniques.
Field experiments show survival rates drop sharply if freeze-thaw cycles exceed three per season.

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

Ice forms only between cells—not inside them—preventing lethal ruptures during expansion. 冰只在细胞间隙形成，而非细胞内部，从而避免结冰膨胀导致致命破裂。
Biomedical researchers study these frogs to improve human organ preservation techniques. 生物医学研究人员正研究这些青蛙，以改进人类器官保存技术。
Enzymes responsible for DNA repair become highly active immediately after thawing begins. 解冻一开始，负责DNA修复的酶便迅速恢复高度活性。

这篇中文题目最接近哪一句？某些青蛙如何在整冬被完全冻成冰块后仍能存活？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？木蛙停止呼吸，心跳暂停，并将体内多达65%的水分冻结成冰晶。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） How Do Certain Frogs Survive Being Frozen Solid All Winter? How to cook noodles A maths worksheet

Ice forms only between cells—not inside them—preventing lethal ruptures during expansion.

Ice forms only between cells—not inside them—preventing lethal ruptures during expansion.

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：Ice forms only between cells—not inside them—preventing lethal ruptures during expansion.