单项选择题

The first ______ of the bridge is one hundred meters long.

A．preface
B．span
C．block
D．phase
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______ 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
Cancer is second only ______ heart disease as a cause of death in the world.
A．to
B．with
C．from
D．of
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