Looming over the debate about human interference in the world’s boreal forests is an as yet unanswerable question. Will the effe

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问题 Looming over the debate about human interference in the world’s boreal forests is an as yet unanswerable question. Will the effects of global warming eventually dwarf man’s impact?

选项 A、raise to greater importance
B、make more difficult to measure
C、cause to appear small
D、bring to an abrupt end

答案C

解析
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