单项选择题

It all started in 1950, when people began to build their houses on the ______ of their cities.

A．paradises
B．omissions
C．orchards
D．outskirts
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单项选择题
Some linguists believe that the ______ age for children learning a foreign language is 5 to 8.
A．optimistic
B．optional
C．optimal
D．oppressed
单项选择题
He added a ______ to his letter by saying that he would arrive before 8 pm.
A．presidency
B．prestige
C．postscript
D．preliminary
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