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答案：
E
Analyze each op
tion:
A. x + y > y --> x > 0. Not true as per diagram x < 0.
B. xz > xy --> reduce by negative x and flip sign: z < y. Not true.
C. tz < z --> reduce by positive z: t < 1. Not true.
D. m^u < 0 --> m^u = (-1)^2 = 1 > 0. Hence, this statement is also not true.
E. t^m > 0. By POE this must be true. To elaborate: t^m = (positive)^(negative) = positive.
Answer: E. 
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