单项选择题

Effective measures must be taken to limit the number of tourists．

A) 对旅游者的数量必须采取有效的限制措施。
B) 应该采取有效的措施来约束大部分旅游者。
C) 我们必须采取有效的措施把大多数的旅游者限制起来。
D) 许多的旅游者因为我们有效的措施约束起来。
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