Trees need water to grow; , friendship needs our heart and passion to develop.A. fortunate

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A. fortunately
B. generally
C. naturally
(答案→)D. similarly
解析：本题考查副词。Fortunately幸运地；generally普遍地；naturally自然地；similarly相似地。句意：树木需要水成长；相似地，友谊需要我们的心和激情发展。