GRE Text Completion: JiJing 1373-GRE填空机经1373题 - LD37QO7U9U9P7F7CA

We often regard natural phenomena like rainfall as mysterious and unpredictable; although for short time spans and particular places they appear so, in fact on a truly global scale, nature has been a model of ____________. A. reliability B. diversity C. complexity D. plasticity E. discontinuity