单项选择题

Many linguists believe that evolution is（ ）for our ability to produce and use language.They claim that our highly evolved brain provides us with an innate language ability not found in lower organisms.

A.reliable
B.responsible
C.available
D.accountable
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单项选择题
In deed more and more schools are discovering that foreign languages are best taught in the lower grades.Young children often can learn several languages by being（ ）to them,while adults have a much harder time learning another language once the rules of their first language have become firmly fixed.
A.disclosed
B.revealed
C.immersed
D.exposed
单项选择题
In the United States it is（ ）not to look at someone who is talking to you.
A.rough
B.coarse
C.rude
D.crude
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