单项选择题

A．expensive
B．artificial
C．educational
D．low-cost
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单项选择题
Which of the following is NOT mentioned as one of the political groups
A．Communists.
B．Socialists.
C．The Liberal Democratic.
D．Reform Group.
单项选择题
A．ourselvesB．customersC．companiesD．us
A．ourselves
B．customers
C．companies
D．us
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