杭州有哪些好的专科学校校园环境好的？至少寝室要...

下列能排酸保碱，维持机体酸碱平衡的有（　　）

A.H+的分泌

B.K+的分泌

C.NH3的分泌

D.H+一Na+交换

E.H+一K+交换

Thenumber of speakers of English in Shakespeare′s time is estimated to have beenabout five million.Today it is estimated that some 260 million people speak itas a(an)21?language,mainlyin the United States,Canada,Great Britain,Ireland,South Africa,Australiaand New Zealand.In addition to the standard varieties of English found inthese areas,22?are a greatmany regional and social varieties of the language as well as?23?levels of usage that are employedboth in its spoken and written forms.
In fact,it is?24?to estimate the numberof people in the world who have acquired an adequate working knowledge ofEnglish in addition to their own languages.The?25?for English learningand the situations in which such learning takes place are so varied that itis 26 to explain and still moredifficult to judge?27?forms an adequateworking knowledge for each situation.
The main reason forthe widespread?28?for English is its present dayimportance as a world language.Besides 29 the indefinite needs of its nativespeakers,English is a language in which some of important works inscience,technology,and other?30 are beingproduced,and not always by native speakers.It is widely used for 31 purposes as meteorological(气象的)and airport communications,international conferences,and the?32?of information over the radio andtelevision networks of many?33.It is a language of widercommunication for a number of developing countries,specially former Britishcolonies.Many of these countries have multilingual?34.and need a language for internalcommunication in such matters as government,commerce,industry,,law and 35 as well as for internationalcommunication and for entrance to the scientific and techno-logicaldevelopments in the West.

第34题答案是（ ）

A.languages
B.populations
C.accents
D.customs

唱、念、做、打这四种表演艺术的表现手段广泛应用于（ ）

A.话剧
B.戏曲
C.电影
D.歌舞剧

纸上得来终觉浅，绝知此事要躬行。”这句话强调的是（　）。

A.直接经验是知识的唯一来源
B.书本知识是根本不可靠的
C.间接经验是知识的唯一来源
D.真理是在实践中检验和发展的