—Must I hand in my homework now， Mr.Smith?—No，you ________.A．can’tB．shouldn’tC．wouldn’tD．needn’t-七年级

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• 在一定的时间内，一个自然生态系统内的生物种类和数量一般是相对稳定的，它们之间及其与环境之间的能量流动和物质循环也保持相对稳定，这种稳定称为__________。-八年级生物
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