Dogs have a very good ______ of smell and are often used to search for survivors in the earthquake.
A:sense
B:view
C:meaning
D:idea
观察下列一组图形中点的个数,其中第1个图形中共有3个点,第2个图形中共有8个点,第3个图形中共有15个点,按此规律第6个图形中共有点的个数是( )
根据句意,用括号内所给提示完成句子。