单项选择题

The duty of a soldier is to defend his country.

A．resist
B．assure
C．guard
D．contribute
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单项选择题
Behind these obvious ridiculous motives to anti-Jewish attitudes there was a deeper cause.
A．unreasonable
B．sad
C．reasonable
D．encouraging
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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