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
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单项选择题
Cancer is second only ______ heart disease as a cause of death in the world.
A．to
B．with
C．from
D．of
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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