填空题

These crowded cities are____________(传染病传播的温床)

【参考答案】

the perfect environment for the transmission of infections

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____________(电视暴为对孩子们的影响) is of concern to many parents and psychologists.

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We believe the high-quality service at the front lines has to start with____________(上层管理人员头脑中的服务意识).