题目内容
3.听下面一段对话,回答第18至第20题.18.What is the speaker mainly talking about?
A.A free lesson website for teachers.
B.A search engine.
C.A language program.
19.Where is Luis von Ahn from?
A.Switzerland.B.Guatemala.C.Costa Rica.
20.How was Duolingo oringinally funded?
A.By big websites.B.By an actor.C.By schools.
分析 略
解答 CBA
点评 略
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