第一步：取A=89，B=96，C=99；

第二步：____；

第三步：____；

第四步：输出计算的结果．

小明用爷爷的老花镜正对太阳，再把一张纸放在它的下面，移动眼镜，在纸上会呈现一个最小最亮的光斑，则老花镜是 ____（凸/凹）透镜，小明发现老花镜可以使稍远处的窗户在光屏上成 ____（正立/倒立）、缩小的像，生活中 ____就是利用这一原理工作的．

   This is a picture of Mr. Green's family. 1 the picture we can see Mr. green, Mrs. Green, their son Jim 2  their daughter Susan. Mr. Green is3  in a chair. He is 4 a newspaper. Mrs. Green 5 some housework. Jim is a Middle School student. He is reading a book near the window.
   Look at 6 , she is playing with her toys 7 the floor. She is Mr. Green and Mrs. Green's daughter, Susan. 8 that behind Susan? It's a  9. What's the cat doing? It's playing  10 a ball.