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经济学家克拉克是主导产业理论研究的先驱者。()

A. 正确
B. 错误

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A. find out scientific rules for themselves
B. make them feel relaxed
C. make them interested in science
D. all of the above

A. 正确
B. 错误

A. 正确
B. 错误

A. visitors
B. owners
C. waiters
D. guests