单选题
In applied investigation, ______.
A、
research workers are allowed to follow unexpected, interesting clues
B、
scientists make a discovery first, and then try to use it
C、
it is the man who is given support
D、
results of practical value are to be achieved
【正确答案】
D
【答案解析】
本题可用排除法，选项A、B、C的内容都是关于pure research的。
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