单项选择题

All the members of the U. N. should pledge to ______ the threat or use of force against other member states.

A．resist
B．reflect
C．refrain
D．retreat
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单项选择题
The new policy may have protected the new city from being polluted as well as the life of its residents ______.
A．affected
B．affecting
C．is affected
D．having affected
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