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题目类型：[单选]
[单选] 设集合M={X∈R|X≤-1}，集合N={∈R|Z≥-3}，则集合MnN=（ ）
A
{X∈R|一3≤X≤-1}
B
{Z∈R|Z≤-1}
C
{X∈R|X≥一3}
D
φ
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