设a>b,则下列各式中不能成立的是( )
A:a+3>b+3
B:a﹣4>b﹣4
C:2a>2b
D:﹣ a2 >﹣ b2
某地的地理坐标是西经17°,北纬28°,该地位于( )
看图,阅读短文,判断正误。
Tommy is a boy. He is apupil. He is a short and thin. He is ten. He gets up early every morning. He gets up at half past six. He brushes his teeth at a quarter to seven in the morning. He goes to school at half past seven in the morning.