51.The historical events of that period are arranged ______.

a.        in alphabetical order       b. in an alphabetical order

b.        in the alphabetical orders   d. 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 novelist     b. a poet and a novelist

b.        poet and novelist      d. the poet and novelist

54.“How did you pay the workers?”

“As a rule, they are paid ______.”

a.        by an your    b. by the hour     c. by a hour    d. by hours

55.The DMZ extends about two hundred kilometers ______.

a. from east to west            b. from the east to west  

c. from the east to the west      d. from eastern to westernliuxuepaper.com