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【多选题】
旅游心理学研究的人主要包括（）A.
旅游者
B.
潜在旅游者
C.
服务人员
D.
管理人员
E.
领导人员
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反馈参考答案：
举一反三
【单选题】How do teachers prevent girls from actively participating in class?
A.
By praising boy students and criticizing girl students frequently.
B.
By assigning girls tasks culturally considered as suitable for them.
C.
By assigning girls difficult math problems they are unlikely to solve.
D.
By asking girl students to prepare classroom materials in advance.
【单选题】To prevent a class from being instantiated, _____________________
A.
use the public modifier on the constructor.
B.
use the private modifier on the constructor.
C.
use the static modifier on the constructor.
D.
don't use any modifiers on the constructor.
【单选题】To prevent a class from being instantiated,_______________________
A.
use the static modifier on the constructor.
B.
don't use any modifiers on the constructor.
C.
use the private modifier on the constructor.
D.
use the public modifier on the constructor.
【单选题】The class teacher came up and put a jacket _____ the boy to prevent him from catching a cold .
A.
by
B.
with
C.
off
D.
over
【简答题】贝塔的定义与哪一项联系更紧密? A．相关系数 B．均方差分析 C．非系统风险 D．资本资产定价模型
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