Look at the figure carefully and answer the questions based on it .
Number of sleeping lines in the figure is ______ .
A16
B15
C18
D19
1234567890-=/*-789 4561230..qwertYUIOP[]\ASDFGHJKL;'ZXCVBNM,./
Look at the figure carefully and answer the questions based on it .
Number of sleeping lines in the figure is ______ .
A16
B15
C18
D19