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【简答题】
7. A number of s are held worldwide annually to celebrate the day, including displaying UPU posters, d speeches, organizing letter-writing competition. (--to state in a formal manner)
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】7. It was not until the early 1940s that stamps were first ________ to the Postal system.
A.
invented
B.
inclined
C.
introduced
D.
induced
【单选题】8. Because of the development of technology and electronic substitution, the mail volume has decreased ________.
A.
conservatively
B.
considerately
C.
concisely
D.
considerably
【单选题】13. By the mid-eighteenth century, this ________ network push thirteen quarrelsome provinces toward developing a new, independent-minded, egalitarian culture more American than British.
A.
rudimentary
B.
authorized
C.
appreciation
D.
debuted
【单选题】9. A stamp design includes several elements required for it to ________ its purpose satisfactorily.
A.
apply
B.
accomplish
C.
acquire
D.
adapt