The girl ______ at her brother because he broke her favourite glass.
A:shouted
B:smiled
C:laughed
D:looked
近年东莞新建楼盘呈现向南部和北部扩展新格局,影响其布局的主要区位因素是( )
设{bn}是等差数列,b1+b2+b3=15,b3+b5+b7=33,Sn是数列{bn}前n项和,令Tn=4Sn+7bn若Tn≥a对一切的正整数n恒成立,则a的取值范围为( )
选字组词。
厉 励
鼓____