生物因素是指（）A．所有的环境因素B．环境中影响生物生活的因素C．影响某种生物生活的其他生物D．影响某种生物生活的一切因素-生物

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• The Spring Festivalin January or February.A．celebrates B．is celebratedC．celebrated D．was celebrated-
• The work is too hard for him. He__________ finish it on time.A．can'tB．mustn'tC．shouldn
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• My father ill yesterday. [ ]A. isn't B. aren'tC. wasn't D. weren't-七年级英语
• 当今许多城市建筑出现“屋顶绿化”，它一般分为屋顶花园和植被屋顶两大类．屋顶花园的植物种类丰富，能够形成一定层次的植物群落，观赏性和稳定性高，但对屋顶的承载能力和土壤-生物
• 一Shall we meet at the station at 8 am?—In fact, we _______. The train _______ until l0 a.m.A．mustn’t
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• Youeat the soup if you don't like it.A．shouldn't B．mustn't C．needn't D．can'
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• 下列某生态系统的组成成分中，属于消费者的是（）A．阳光B．野兔C．牧草D．细菌-生物
• 在菜园里，蚯蚓昼伏夜出，以凋落的黄叶、腐败有机物为食，排出的粪便中含有丰富的氮、磷、钾等无机盐．蚯蚓在土壤中活动，可以以疏松土壤，改善土壤结构．（1）蚯蚓在此生态体统-生物
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