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
He added a ______ to his letter by saying that he would arrive before 8 pm.
A．presidency
B．prestige
C．postscript
D．preliminary
单项选择题
He told a story about his sister who was in a sad ______ when she was ill and had no money.
A．plight
B．polarization
C．plague
D．pigment
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