____ Simon good at English? [ ]A. Do B. Are C. Does D. Is -七年级英语

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• —What's in the reading room?— There a teacher, twenty desks and thirty chairs in it. [ ]A. am B
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• 生物圈中的动物必须直接或间接地以______为食，通过消耗绿色植物合成的______来维持生活，所以，动物是生物圈中的______．-生物
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• 近年来，我国大力开发建设西部地区．要求西部地区切实搞好生态环境保护，退耕还林，治理水土流失，防止沙漠化等．据此回答下列问题：（1）从生物学角度分析，改善西部生态环境，首-生物
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