I can’t go to the cinema with you because I _______ stay here until my mother comes back.A．canB．coul

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• 小郭自制了一个密闭的生态瓶，要使模拟的生态系统维持更长时间，该生态瓶最好放在（）A．床柜上B．阳台上C．冰箱里D．衣柜里-生物
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