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
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单项选择题
The crowd ______ into the hall and some had to stand outside.
A．outgrew
B．overthrew
C．overpassed
D．overflew
单项选择题
This problem should be discussed first, for it takes ______ over all the other issues.
A．precedence
B．prosperity
C．presumption
D．probability
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