— What can you do?— I_____ play football.[ ]A. canB. shouldC. may D. would-七年级英语

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• 下图为生态系统碳循环示意图，请据图回答下列问题。（1）由图可知，碳在生态系统中主要以_________的形式进行循环。（2）大气中的二氧化碳首先依赖于图中②所代表的_________进入-八年级生物
• 肉类和鸡蛋的价格比粮食和蔬菜高，从生态学的观点看，这是由于[]A．饲养动物麻烦，时间长，投资大B．动物性食品营养价值高C．食物链延长，能量流失多，动物性食品成本高D．栽培植-八年级生物
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• I __________ dance but I___________ dance well.[ ]A. can; canB. can; can'tC. can't; canD.
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• 古书《说苑．正谏》中有这样一段记载：“园中有树，其上有蝉，蝉高居悲呜，饮露，不知螳螂在其后也；螳螂委身曲附欲取蝉，而不知黄雀在其傍也；……”这是比喻社会现象的寓言，但却反-八年级生物
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• 从物质循环的观点看，生物体内碳元素的最终来源是[]A．食物所含有机物中的碳B．非生物界中的碳酸盐C．大气中的二氧化碳D．生态系统中的生产者-八年级生物
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