Man is not only a ______ in nature but also a ______ of nature.
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Human beings' dependence on nature becomes more and more ______.
At the same time, we depend more than ever before on nature for its _____________________.
The ecological crisis is a ______ problem which requires ________ among different nations.
个体膳食摄入量调查最常用的方法是
A. 膳食史法
B. 24h膳食调查法
C. 称重法
D. 记账法
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