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
______ a sudden explosion, there is a real probability that these kids could be injured.
A．Being there
B．Should there be
C．There was
D．There have been
单项选择题
Smith did the only ______ thing by asking the Indians for food and shelter in their village.
A．sensitive
B．sentimental
C．sensible
D．sensational
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