单项选择题

Our practices are conformable to the requirements（）by international organizations.

A.laid down
B.lied down
C.layd own
D.laid out

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单项选择题

This S C may be（）three months before its expiry.

A.postponed
B.prolonged
C.expanded
D.renewed

单项选择题

By（）computation, the seller estimated that the profit will be 5 %.

A.coarse
B.crude
E.rough
D.rude

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