单项选择题

The Ebook Reader is used for（）

A．reading an ebook you’ve downloaded
B．turning a print book into a digital version
C．downloading an ebo0k from the Internet
D．copying an ebook onto a portable computer

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单项选择题

What is required of all domestic and international passengers for check-in（）

A．An invitation letter.
B．A company’s job Offer.
C．An official photo identification.
D．An official immigration permit.

单项选择题

An international flight passenger should check in at least（）

A．20 minutes before departure
B．30 minutes before departure
C．45 minutes before departure
D．60 minutes before departure