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【多选题】
要约的失效有下列情形之一的，要约失效（）A.
拒绝要约的通知到达要约人
B.
要约人协商撤销要约
C.
承诺期限届满，受要约人未作出承诺
D.
受要约人对要约的内容作出实质性变更
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【单选题】听力原文：We would like to remind passengers that this is a non-smoking facility. Please limit smoking to the designated areas located outside the terminal building. Under federal safety regulations, all b...
A.
At a train station.
B.
At a bus station.
C.
At an airport.
D.
On a cruise ship.
【单选题】听力原文：Rex Jink, the manager in charge of accounts would like to remind employees that all end-of-year expense claims are due before the end of next week. Any claims that are received by the claims depa...
A.
To remind employees of a party
B.
To ask workers to file expenses
C.
To check to see if workers have been paid
D.
To help employees understand taxation
【简答题】Go straight. ________________________________________
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