It’s the protection for the trees really matters, how many trees are planted each year.A

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A. which; or rather
B. as; more than
C. what; other than
(答案→)D. that; rather than
解析：考查强调句型和固定结构。第一空的that与it is构成强调句型。Or rather更确切的是；more than超过，不仅仅，非常；other than除…之外；rather than代替，而不是；结合句意可知D正确。句意：真正重要的是保护树木而不是每年种了多少树。