5.【解析】选B。句意: 这个演讲主要涉及孩子们在辨别是非上的困难。have trouble(in)doing sth. 做某事费力(或困难), 所以用distinguishing。

　　Ⅱ. 1. made contributions to

　　2. inform them of

　　3. play an important part in

　　4. feel confused about

　　5. came into use

　　6. when it is convenient to you

　　Ⅲ. 【参考范文】

　　Aside from being mother tongue of Britain, the USA, and Australia also have made great contributions to the development of English. Though their English differs from each other, they can’t be mistaken. English is one of the official languages in many countries, which plays an important part in the international communication. It is certain that most scientific achievements are in English, and therefore it is necessary to learn English well. Nowadays, it is convenient to learn English in that many websites are in English.

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