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
To cry over spilled milk is to cry（）

A．in a vain
B．in the vain
C．in vain
D．in no vain
单项选择题
To be（）I couldn’t understand what he was getting at. If you wanted to know you’d better ask someone else.

A. sly
B. humble
C. honest
D. cowardly
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