According to Werner Kurz what are the forests in Canada like today？A．They are a significa
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According to Werner Kurz, what are the forests in Canada like today？
A．They are a significant distortion.
B．They are changing to a new source.
C．They have been a carbon sink.
D．They have changed to a carbon source.
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正确答案：D
解析：段末处及细节处设题。本题解题关键在于理解... the forests have shifted from being a carbon sink to a carbon source. 森林已经从carbon sink变成carbon source，故D为答案。shire from... to... “由……变成……。”