对大肠杆菌作用最强的是（）

Initially the writer did not want to buy a hearing aid because（）.

A．it would make him look old
B．it would make him nervous
C．it was too expensive
D．it was old-styled

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房地产业是房地产开发和建设的甲方,建筑业是乙方。( )

A.正确
B．错误

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