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
I am_______ of his methods which he spent two months researching; they seem not very scientific to me.
A．sturdy
B．skeptical
C．indefinite
D．hysterical
单项选择题
After careful examination the doctor______ the illness of the child as pneumonia.
A．conceived
B．affirmed
C．embodied
D．diagnosed
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