Linguistic researchers have gradually come to understand how and why so many teenagers sou

Linguistic researchers have gradually come to understand how and why so many teenagers sound like Dizzee Rascal, a rapper from Bow in east London. They call this【C1】______. changing argot(俚语)Multicultural London English(MLE). When MLE first【C2】______, linguists believed it was a ham version of the way West Indians speak English. In the early 1980s " West Indians who had spoken Cockney suddenly started to speak 【C3】______," explains Paul Kerswill of York University. Young Afro-Caribbean men【C4】______ have adopted a new style. of speech as they sought to forge a(n)【C5】______in an often hostile society. Others were thought to have【C6】______ them. But【C7】______being cod-Jamaican, MLE is now thought to be a hybrid(混合的)【C8】______ that emerged from the mixing of West Indians, South Asians and speakers of Cockney and Estuary English. Researchers have found that MLE【C9】______ from place to place. Variants have emerged in 【C10】______cities with many immigrants, such as Birmingham and Manchester. Children tend to 【C11】______MLE at secondary school. It is more common—and more strongly accented—among boys【C12】______among girls. The grammar that tends to【C13】______ MLE is increasingly uniform. for example the use of " we wasnt"【C14】______place of "we werent". Linguists are most excited by【C15】______ MLE is doing to the rhythm of speech. English is usually spoken with a stress-timed rhythm, in which syllables are stressed at regular【C16】______. Speakers of MLE speak with a syllable-timed rhythm, in which all syllables are【C17】______ roughly the same time and stress, as in French or Japanese. Syllable-timed speech is a【C18】______ of languages that have come Into contact 【C19】______other languages. Versions of it may have【C20】______in multicultural places such as Hackney for centuries, thinks Mr. Kerswill.

【C1】

A．spreading

B．expanding

C．extending

D．stretching

请帮忙给出正确答案和分析，谢谢！