A:0.225
B:0.25
C:0.45
D:0.50
用显微镜观察微小物体时,目镜上标有“5×”字样,物镜上标有“40×”字样.则观察到的物体的实际放大倍数是( )
None of my friends ______at 10, so I realized it was a trick and felt really embarrassed.