单项选择题

When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.

A．at length
B．at random
C．in essence
D．in bulk
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单项选择题
According to the passage, the author's attitude to unemployment is that ______
A．the individuals were to blame
B．the loss of overseas trade was to blame
C．the unemployed cannot understand why
D．it was not the individual's fault
单项选择题
By ______ computation, he estimated that the repairs on the house would cost him a thousand dollars.
A．coarse
B．rude
C．crude
D．rough
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