①水滴石穿 ②谈虎色变 ③惊弓之鸟 ④春暖花开
A:①—④—②—③
B:④—①—②—③
C:④—①—③—②
D:①—④—③—②
河北在历史上曾属于赵国和燕国,所以被称为“燕赵之地”.其文化博大精深,自古就有“燕赵有慷慨悲歌之士”的说法,是英雄辈出的地方.从地理位置上看,与河北省东北部相接的省级政区域单位是( )
-- How did your class raise money for the poor old man in hospital?
-- We organized a book fair on the playground and sold some books and CDs.
一 We have five kinds of schoolbags. Do you like this one?
一 No. Can you show me ?
如图为周期表中短周期的一部分,若X原子最外层电子数比次外层电子数少3,则下列说法正确的是 ( )