单项选择题

At the end of the discussion, he summed up and added a few points.（）

A．totaled
B．abstracted
C．summarized
D．explained

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单项选择题
The safety factor is primary in all underwater operations.（）

A．perfect
B．the full view
C．maximum
D．principal
单项选择题
A judgement may be revised or reversed in the light of some particular action.（）

A．changed
B．overtaken
C．resolved
D．resumed
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