51.The historical events of that period are arranged ______.
a.in alphabetical order b. in an alphabetical order
b.in the alphabetical ordersd. in a alphabetical orders
52.The like to take a vacation ______.
a.one time the year b. one time in a year c. once a year d. once in a year
53.“What is Todger?” “He is ______.”
a.a poet and novelistb. a poet and a novelist
b.poet and novelistd. the poet and novelist
54.“How did you pay the workers?”
“As a rule, they are paid ______.”
a.by an your b. by the hourc. by a hour d. by hours
55.The DMZ extends about two hundred kilometers ______.
a. from east to westb. from the east to west
c. from the east to the westd. from eastern to western
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