单项选择题

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
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单项选择题
Which of the following most accurately describes the pattern of the passage
A．The author first refutes the classification of research into the pure and the applied and then analyze the reasons for the intellectual snobbery and tendency to look down on the one of the two.
B．The author first refutes the classification of research into the pure and the applied and then presents his own classification.
C．The author first refutes the classification of research into the pure and the applied and then points out that the classification results from two false ideas.
D．The author first points out the practical importance of applied research and then criticizes those who look down on applied researc
单项选择题
In the past, many doctors ______.
A．never thought of any possible link between stress and illness
B．hardly considered emotional factors when dealing with a patient
C．discovered that the brain and the immune system functioned independently
D．found that diseases were caused by psychological factors
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