执行下面的程序段后，变量S的值为（）。S=5For i=2.6 To 4.9 Step 0.6 S=S+1 Next i
参考答案：I
请根据下面提示，写一篇短文，词数不少于50.
In your spoken Endlish class, your teacher shows you the following picture. You are asked to describe the picture and explain how you understand it.
清洗卫生间时，应在门口竖立（）指示牌，提醒用户注意。
A.正在使用
B.正在清洁
C.正在维修
D.稍后使用
