单项选择题

The safety factor is primary in all underwater operations.（）

A．perfect
B．the full view
C．maximum
D．principal

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单项选择题
The Basque separatist movement is waging a campaign against the Government.（）

A．conducting
B．planning
C．paying
D．engaging
单项选择题
Some drugs taken in large quantities can cause permanent brain damage.（）

A．temporary
B．lasting
C．dangerous
D．serious
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