普朗克曾这样评论爱因斯坦的科学成就:“这个原理在物理世界观上所引起的革命,只有哥白尼世界体系的引入才能与之相提并论。”文中的“这个原理”是( )
直接写出结果.
67÷94=____
7﹣3.8=____
1÷12.5%=____
2.6+ 25 =____
202=____
7a×6a=____
2.4×5=____
6÷(12-13) =____
读一读,写一写
①— Are there any ____ ?
— Yes, there are.
②There are many tall ____ in my city.
③There is a ____ above the river.
④- Are there any houses in the ____?
-Yes, there are.