题目

听材料,回答问题。 (1) What is the speaker mainly talking about? A . A search engine. B . A language program. C . An online dictionary. (2) How many people use Duolingo currently? A . Over one hundred million. B . A few hundred thousand. C . Several thousand. (3) Where is Luis von Ahn from? A . Switzerland. B . Guatemala. C . Costa Rica. (4) How was Duolingo originally funded? A . By big websites. B . By an actor. C . By school. 答案: B A B A
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