我们的红领巾按边分是 ____三角形，其中一个底角是30°，它的顶角是____度．
A. spring B. farm the land
C. go on outings D. new green leaves
E. warmer and warmer F. fly kites
G. longer and longer H. four seasons
When Peter comes, please ask him to leave a______.
2345是由____个千、____个百、____个十和____个一组成的．
下列函数中，最小值为4的函数是( )
