单项选择题

-（）？-My mother is retired.My father is a manager.

A.What are your parents doing right now
B.Do your parents still work
C.What do your parents do

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在国际贸易中，卖方所承担的风险、责任的大小与商品价格的高低成。

答案：正确

单项选择题

We have quoted our most favorable price，so we are unable to （） any counter offer.

A.offer
B.supply
C.like
D.entertain