单项选择题

The main purpose of writing these three texts is ______.

A．to invite people to see films
B．to invite people to topic discussions
C．to attract more students to attend lectures
D．to attract more people to watch TV programs

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单项选择题What does the underlined word spam in the first paragraph probably refer to

A．Unwanted electronic information that roaches computer users.
B．Computer virus that causes computer communication difficulties.
C．Advertisements sent out by companies who want to sell their products.
D．Companies that send out millions of copies of the same sales information.

单项选择题Which of the following is true according to the text

A．Companies who want to send a great deal of advertising are referred to as spammers.
B．Spammers are people who collect e-mail addresses from websites, news groups and "chat rooms".
C．Either individuals or organizations can be regarded as spammers if they send out spare.
D．Spammers are people who receive spam of their computers.