其它
Paula shoots arrows at the following target. When she misses, she obtains zero points. Paula shoots two arrows and adds the number of points. Which of the following sums cannot be her score? 
Overseas Competition->Knowledge Point->Counting Modules->Law of Addition and Multiplication->Law of Addition
A is possible as 30+30 = 60  B is possible as 70+0+0 = 70  C is possible as 30 + 50 = 80  E is ossible as 30 + 70 = 100. 