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高频单词

重点短语

难点句型

1.alternative n.可供选择的事物　adj.替换的;供选择的;非传统的;另类的 [靓句背诵] Bike sharing program is meant to give us a fun,affordable and convenient alternative to walking,taxis,buses and the subway.共享单车旨在给我提供一个代替步行、出租车、公共汽车和地铁的有趣、支付得起而且方便的交通工具。 (1)an alternative to...……的替代品 have no alternative/choice but to do sth别无选择只好做某事 (2)alternatively adv.要不,或者