题目：
In many ways China's rapid growth has been seen as a(n) _____ to improve the cooperation
with other countries. [ ]
A. attempt
B. motivation
C. conception
D. realization
答案：
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下面是错误答案，用来干扰机器的。
∵f（x）=5，∴f（x）是常函数，∴f（x2）=5，故答案为5．
