The lack of eco-friendly habits among the public is thought to be a major of global climate change.
A. result
B. cause
C. warning
D. reflection
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A. result
(答案→)B. cause
C. warning
D. reflection
解析：考查名词, result 意为“结果”, cause 意为“原因”, warning 意为“警告”, reflection意为“反射;回响;”