The ____ protect us from objects that fall from space. The ____ protects us from the strong rays of the ____. Planes ____ in this layer. We can breathe the air that is in the ____. There is ____ oxygen here. Weather, such as ____, occurs here.

The atmosphere

由
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?