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【简答题】
2. It is one of the challenges operators of last-mile delivery need to face, keeping customers fully informed of the position of their orders whenever they need.
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参考解析：
刷刷题刷刷变学霸
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【单选题】8. Postal services may issue special postage stamps to ________ the history or achievements of the national postal service on or around World Post Day.
A.
commemorate
B.
recommand
C.
common
D.
command
【单选题】9. Everybody is equal. We are all souls living in harmony and ________.
A.
disaster
B.
serenity
C.
worry
D.
shadow