填空题____
填空题
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参考解析
解析：
assumed。考点:动词。分析句子结构可知，该句缺少谓语，且空格前为助动词had，故应填入动词的过去分析形式，构成过去完成时。对于科学研究，步骤一般是先假设，然后通过证据和事实来证实；因此根据下一句中“much more careful observation has shown（更详细的观察已经显示）”，assume“假定，假设”，符合句意，故选A项。
assumed。考点:动词。分析句子结构可知，该句缺少谓语，且空格前为助动词had，故应填入动词的过去分析形式，构成过去完成时。对于科学研究，步骤一般是先假设，然后通过证据和事实来证实；因此根据下一句中“much more careful observation has shown（更详细的观察已经显示）”，assume“假定，假设”，符合句意，故选A项。
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