单项选择题

We have pleasure in advising that a （　） was established in your favour through Bank of China.

A．confirmed credit
B．contract
C．way bill
D．packing list
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单项选择题
The products described above have been subjected to （ ） treatment of at least 80oC for 30 minutes.
A．freeze
B．cold
C．heat
D．wash
单项选择题
以下入境商品无需办理检疫审批手续的是：
A．苹果
B．牛肉
C．鲜奶
D．马铃薯细粉
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