Where are my keys? I _____ find them. [ ]A. aren't B. can't C. am not D. don't-七年级英语

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• 2001年9月11日，美国发生了震惊世界的“撞击事件”，自此次恐怖活动之后，美国国会议员又遭遇了“炭疽热”的侵扰．请分析“炭疽热”的病原体属于生态系统的（）A．生产者B．消费者C．分解-生物
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