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建设工程施工任务委托的模式，反映了建设工程项目发包方和承包商办之间、承包方与分包方等相互之间的()。

A. 委托关系
B. 合同关系
C. 合作关系
D. 代理关系

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By saying "but now they' ve become wallflowers" (Line 3, Paragraph 4), Dr. Fowler intends to show that______.

A. those who are isolated by clusters tend to quit smoking
B. those who keep smoking are now loosely connected to their previous groups
C. those ongoing smokers tend to drive their friend away in parties
D. smoking in clusters are bad for the health of individuals and society alike

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