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 interactiveness;  second,  the  chosen  topics  is  familiar  to  the  testees  and  the genre and style of short passage in listening materials are valid; third, the authenticity of  audio  input  need  to  be  improved  due  to  the  perfect  and  precise  accent  and pronunciation;  fourth,  the  length  and  speed  of  listening  materials  are  moderate  and advisable. Therefore, we should conduct more effects to improve the appropriateness of the test content for assessing the testees’ comprehensive language competence and in order to design a better PRETCO-B paper.  

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conclusion

Though  the  writer  has  put  great  efforts  to  conduct  and  complete  this  research systematically and scientifically, there are still some insufficiencies and limitations in this dissertation, which are presented as follows: 
1)  First  of  all,  the  subjects  of  the  investigation  in  this  research  are  chosen  at random from the Jiangxi College of Construction and Jiangxi  Vocational  College of Economic Management. These two vocational colleges are merely two representatives of  schools  of  construction  and  economy  in  Jiangxi  Province.  Nevertheless,  two schools  are  far  from  enough.  The  later  researchers  should  count  in  more  vocational college  students  who  come  from  various  vocational  and  specialty  colleges  in  their later  and  further  studying  with  the  purpose  of  gaining  more  scientific  and  overall studying result. 
2) Secondly, the studying object is only the listening comprehension subtest. As a matter of fact, other parts of PRETCO-B such as translation, reading comprehension etc.  ought  to  be  researched  in  the  later  research  in  order  to  obtain  reliable  and comprehensive  acquaintance  of  the  listening  comprehension  subtest. Just  only  when all the parts of the test are coincident internally, can each part be believed to be valid. Hence, the writer suggests that other parts in the PRETCO-B should be added in the further studying for the sake of getting impartial and full-scale understanding on the validity.  
3)  Thirdly,  due  to  the  limited  times,  the  writer  only  research  the  face  validity, content validity and user response validity of the listening comprehension subtest in PRETCO-B from Dec.2008 to Jun. 2013. Therefore, the  results of validity study on PRETCO-B listening subtest aren’t all-around and incomplete. 
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The reference (omitted)
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