5 Let $0<2a<1, M=1-a^{2}, N=1+a^{2}, P=\frac{1}{1-a}, Q=\frac{1}{1+a}$, then
A. $Q<P<M<N$
B. $M<N<Q<P$
C. $Q<M<N<P$
D. $M<Q<P<N$
5 C. 

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