单项选择题

Keys should never be hidden around the house since thieves ______ know where to look.

A．virtually
B．initially
C．invariably
D．infinitely
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单项选择题
Human facial expressions differ from those of animals in the degree to which they can be ______ controlled and modified.
A．deliberately
B．consequently
C．originally
D．absolutely
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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