单项选择题

Although specific concerns may determine the intent of a research project, its results are often ______.

A．unanticipated
B．beneficial
C．expensive
D．spectacular
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单项选择题
The trainees were given copies of a finished manual to see whether they could themselves begin to ______ the inflexible, though tacit, rules for composing more of such instructional materials.
A．design
B．revise
C．disrupt
D．derive
单项选择题
______, the factories had not closed, and those who needed work most were given a chance to survive during the econmic disaster.
A．Unintentionally
B．Mercifully
C．Importunately
D．Tragically
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