The maximum sum is $$6+6=12$$, so "the sum of dots is $$13$$" is an impossible event; so $$\text{D}$$ is the answer. 
Throw two dice of the same quality and size. The six sides of each die are marked with number of dots from $$1$$ to $$6$$. Among the following options,~\uline{~~~~~~~~~~}~is an impossible event. 
Options:
A: The sum of dots is $$12$$. 
B: The sum of dots is smaller than $$3$$. 
C: The sum of dots is larger than $$4$$ but smaller than $$8$$. 
D: The sum of dots is $$13$$. 