A:take a tur
B:by tur
C:in tur
D:take tur
420×70=42×____ =4200×____
如图所示,右面水杯的杯口与投影面平行,投影线的方向如箭头所示,它的正投影图是( )
The teacher's name is Henry Mason. His students call him ________.
写出反义词
保护—____ 弱小—____ 勇敢—____