练习：
1． In the second paragraph the author thinks that
A)some backward race doesn’t have a language of its own．
B)some race in history didn’t possess a language of its own．
C)any human race，whether backward or not，has a language．
D)some races on earth call communicate without language．
2． According to the author， people of undeveloped cultures can have___ languages.
A)complicated
B)uncivilized
C)primitive
D)well—known
3．The author has used American Indian languages as an example to show that they are
A)just as old as some well-known languages．
B)just as sophisticated as some well-known languages．
C)more developed than some well-known languages．
D)more complex than some well-known languages．
4. Which of the following statements is INCORRECT?
A)A language is a means of expressing a particular culture．
B)All languages can well express their respective cultures．
C)American Indian languages are as sophisticated as English．
D)Some languages are better than other languages．
5．According to the author， language changes are most likely to occur in
A)grammar．
B)pronunciation．
C)vocabulary．
D)intonation．