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20 15 Mathematics Examination Paper of the Second College Entrance Examination in Hedong District: Seeking the Answer
Positive solution:

1、C

M={y|y≥ 1}

N = {x | x ≥ 1 or x ≤- 1}

m? ordinary

So choose C.

2、B

Theorem 2 for judging plane parallelism;

If two intersecting lines in one plane are parallel to the other plane, the two planes are parallel.