1. That as much as one-fourth of all timber harvested is not used proved to be false.
解析：
句子的主干是：That 引导名词性从句作主语，谓语动词是proved，to be false 是不定式作表语；在主语从句中，主语是timber，as much as one-fourth of all是主语timber 的前置定语，harvested 是timber 的后置定语，谓语是is not used；此句中that 引导的名词性从句置于句首，表面上看头重脚轻，实际这是一种语言修辞，是一种强调手段
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