Module 9 Population Unit 3 Language in useLanguage practice1.Beijing is a huge city.2.It takes an hour to get there by bus.3.That’s almost one fifth of the world’s population.4.That makes over 131.4 million births a year.1. 不定冠词 a / an 的用法：1) a 用以辅音音素开头的单词前， an 用...
