单项选择题

The underlined word "dubious" (Line 2, Par

A．2) most probably means _______.A. valuableB. usefulC. doubtfulD. helpful
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单项选择题
From the passage it earl be seen that employeeship helps one _______.
A．to be more successful in his career
B．to be more specialized in his field
C．to solve technical problems
D．to develop his professional skill
单项选择题
It is implied that fifty years ago _______.
A．eighty per cent of American working people were employed in factories
B．twenty per cent of American intellectuals were employees
C．the percentage of intellectuals in the total work force was almost the same as that of industrial workers
D．the percentage of intellectuals working as employees was not so large as that of industrial workers
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