题目内容

Which of the following is NOT mentioned as a reason for the disrupted sleep of travelers

A. Crossing different time zones.
B. Changing light and activity levels.
C. Working longer hours.
D. Watching out of the plane for a long time.

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Compared with the clear words of her boyfriend on screen, his accent is

A. obscure.
B. distinct.
C. unreal.
D. misleading.

图4-6示意的为（）设计模式，表示一个作用于某对象结构中的各元素的操作。

A. Visitor(访问者)
B. Observer(观察者)
C. Flyweight(享元)
D. Prototype(原型)

The dolphin leapt up into the air because Sagan was too near the water.

A. Right
B. Wrong
C. Not mentioned

（）具体负责实施对导游人员的年审工作。

A. 旅行社或导游管理服务机构
B. 国家旅游局
C. 省级旅游行政管理部门
D. 所在地旅游行政管理部门