(____)1. A. Tuesday B. Thursday C. tomorrow
(____)2. A. ping-pong B. cartoon C. football
(____)3. A. me B. his C. her
(____)4. A. morning B. afternoon C. birthday
(____)5. A. erhu B. robot C. piano
南美洲和非洲两块大陆轮廓几乎可以凸凹相接成一体,这能最好地证明( )
— What can I do for you, sir?
— I'd like two ________.
物体放在凸透镜的主光轴上,在距透镜40cm处的光屏上得到一个倒立、放大的像,则该透镜的焦距可能为( )