单选题 .  The number of speakers of English in Shakespeare's time is estimated to have been about five million. Today it is estimated that some 260 million people speak it as a(an)     1    language, mainly in the United States, Canada, Great Britain, Ireland, South Africa, Australia and New Zealand. In addition to the standard varieties of English found in these areas,     2    are a great many regional and social varieties of the language as well as     3    levels of usage that are employed both in its spoken and written forms.
    In fact, it is     4    to estimate the number of people in the world who have acquired an adequate working knowledge of English in addition to their own languages. The     5    for English learning and the situations in which such learning takes place are so varied that it is     6    to explain and still more difficult to judge     7    forms an adequate working knowledge for each situation.
    The main reason for the widespread     8    for English is its present day importance as a world language. Besides     9    the indefinite needs of its native speakers, English is a language in which some of important works in science, technology, and other     10    are being produced, and not always by native speakers. It is widely used for     11    purposes as meteorological(气象的) and airport communications, international conferences, and the     12    of information over the radio and television networks of many     13    . It is a language of wider communication for a number of developing countries, specially former British colonies. Many of these countries have multilingual     14    and need a language for internal communication in such matters as government, commerce, industry, law and     15    as well as for international communication and for entrance to the scientific and technological developments in the West.1.