1.Look at the following numbers:
-6, 0, 6, 12
Which pair of numbers has a sum of 0?
A: 6, 12
B: 0, 6
C: -6, 0
D: 6, -6
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2.Look at the following numbers:
-10, -5, 0, 5
Which pair of numbers has a sum of 0? (5 points)
A: -10, 5
B: 0, 5
C: 5, -5
D: -5, 0