填空题：What do rainforest trees tightly rely on? [A] Saplings. [B]

题目内容：

What do rainforest trees tightly rely on?
[A] Saplings.
[B] Microorganisms.
[C] Flora and fauna.
[D] Insects and birds.

参考答案：

答案解析：

盐酸克林霉素是

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