The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
左栏的文本框排列顺序是乱的。请把它们拖到右栏，恢复成原文的正确顺序。
Source
1But just one ring of ripples is generated when ten stones are thrown into water within one second.
2Several rings of ripples are generated when several stones are thrown into water.
3A ring of ripples is generated when a stone is thrown into water.
4It is about'frequency'.
Target
加载中…
我的练习记录
加载中…