What do we mean by a perfect English pronunciation？ In one sense，there are as many differe

nt kinds of English__11__there are speakers of it.No two speakers speak in exactly the same__12__. We hear different forms of English，and the pronunciation of English__13__a great deal in different geographical areas.How do we decide what sort of English to use as a model？ This is not a question that can be__14__in the same way for all foreign learners of English. ___15__you live in a part of the world like India or West Africa，where there is a long___16__0f speaking English for general communication purposes，you may___17__a good variety of the pronunciation of this area.It would be a(n) ___18___in these circumstances to use BBC English as a model.However，if you live in a country___19__there is no tradition of using English，you should choose to learn some form. of native English___20__.It does not matter very much which form. you choose.The most effective way is to take as your model the sort of English you can hear most often.

11题选()

A.than

B.as

C.before

D.when

12题选()A.type

B.form

C.sort

D.way

13题选()A.alters

B.varies

C.shifts

D.distinguishes

15题选()A.Because

B.Where

C.If

D.Whether

17题选()A.inquire

B.enquire

C.acquire

D.require

18题选()A.fashion

B.manlier

C.situation

D.occasion。

19题选()A.where

B.that

C.which

D.wherever

20题选()A.communication

B.grammar

C.pronunciation

D.vocabulary

14题选()A.given

B.responded

C.satisfied

D.answered

16题选()A.history

B.habit

C.custom

D.hobby

请帮忙给出每个问题的正确答案和分析，谢谢！