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 random
B．at will
C．at length
D．in essence
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单项选择题
To tell you the truth, I cannot help but ______his courage and wisdom after I heard of his stories.
A．admiring
B．admire
C．to admire
D．admired
单项选择题
Probability is the mathematical study of the ______of an event's occurrence.
A．predictability
B．possibility
C．feasibility
D．undesirability
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