填空题

Although some form of certificate was used for centuries to allow individuals to travel safely in foreign lands, it was in 19th and 20th centuries that the passport was adopted by all countries.

【参考答案】

Y

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填空题

In the United States, the passport is valid for 10 years for people under 18.

问答题

现在“瘦身”很流行。请你谈一谈“瘦身”一词的含义和人们喜欢它的原因以及如何去瘦身。 Slimness