关于生态系统的碳循环，下列说法正确的是（）
A.碳循环具有全球性
B.碳在生物界和无机环境间循环往复
C.碳从无机环境进入生物体内要通过生产者
D.碳从生物体内去到无机环境只能通过呼吸作用
参考答案：A, B, C
解析：
碳循环具有全球性，是在生物群落与无机环境之间的循环，碳从无机环境进入生物群落是以CO2形式进入合成有机物，通过细胞呼吸、燃烧而释放到无机环境中去，所以ABC选项正确。
考点：考查生态系统的碳循环相关知识。意在考查考生理解所学知识的要点，把握知识间的内在联系的能力。
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