单项选择题

院士属于专家梯队的哪一种？（）

A.资深从业者：具有独立完成工作所需的知识和技能
B.骨干从业者：具备某一领域的技术专长
C.专家从业者：对某个领域有深刻而广泛的理解
D.资深专家从业者：具有系统全面或精深的知识和技能

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多项选择题

Read the following passages and identify the problems in reasoning.

Some people say that calling people names because of the way they look is offensive. My friend is very overweight and people call him names for being fat. He says he doesn't mind as he finds horrible things to call back. This shows there is no harm in calling people names as they can just retaliate if they want to.
A、false correlation
B、insufficient number of evidence
C、lack of representativeness
D、no error

多项选择题

下列关于法律义务，说法正确的有（）
A、法律义务是历史的
B、法律义务源于现实需要
C、法律义务必须依法设定
D、法律义务可能发生变化