Today, the earth is in trouble for the following reasons EXCEPT thatA．our planet is a clos

Today, the earth is in trouble for the following reasons EXCEPT that

A．our planet is a closed system.

B．factories pour dirty water into rivers.

C．cars and factories put poisons into the air.

D．people throw bottles and paper carelessly.

请帮忙给出正确答案和分析，谢谢！

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