单项选择题

A．A lecture in their American literature course.
B．A film about the American frontier.
C．A book they both read.
D．The woman’’s recent trip to the American Midwest.
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单项选择题
Which of the following elements is the most critical to online security according to the author
A．IT culture.
B．Operating systems.
C．Desktop antivirus software.
D．The efforts by online security vendors.
单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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