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.

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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

单项选择题

From this passage, we learn that an ebook（）

A．can be found in any library
B．can be read directly from the Internet
C．can be read by any one who has a computer
D．can be read when special software is installed