阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
There are about fifteen hundred languages in the world. But 36 a few of them are very 37 .English is one of these. Many, many people use it, not only in England and the U.S.A., but in other parts of the world. About 200,000,000 speak it as their own language. It is difficult to say how many people are learning it as a 38 language. Many millions are 39 to do so. Is it easy or difficult to learn English? Different people may have different 40 Have you ever 41 ads of this kind in the newspapers or magazines? "Learn English in six weeks, or your 42 back..." "Easy and funny! Our records and tapes 43 y
