单选题：Despite the __________, Alzheimer' s researchers are still _

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题目内容：
Despite the __________, Alzheimer' s researchers are still __________ about the prospects for immunization, though most agree that more results are needed from humans for us to truly understand immunization's effects.

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The author cites all of the following as obstacles to the su

The author cites all of the following as obstacles to the success of African Ame

分类：GRE  题型：单选题
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Although demographers cannot ________ that live TV broadcast

Although demographers cannot ________ that live TV broadcasting has a considerab

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2007--2008年，浙江连锁餐饮企业增加的营业面积占全国增加面积的比例为（　　）。

2007--2008年，浙江连锁餐饮企业增加的营业面积占全国增加面积的比例为（　　）。

分类：GRE  题型：单选题
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某企业月初结存材料的计划成本为250万元，材料成本差异为超支差45万元；当月入库材料的计划成本为550万元，材料成本差异

某企业月初结存材料的计划成本为250万元，材料成本差异为超支差45万元；当月入库材料的计划成本为550万元，材料成本差异为节约差85万元；当月生产车间领用材料的

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