You may open your electronic mail and find information about how to buy medicine, cheap airline tickets, and books and, of course, computers and computer products．There may also be offers for investment deals, bank loans and special holidays．However, to many computer users, this use of electronic spam to sell products has become a major problem as it makes computer communication more difficult．
Many companies who want to send a great deal of advertising might use the services of a “spammer．” A spammer is a person or company that uses computers to send out millions of copies of the same sales information．Spammers find e-mail addresses from websites, news groups and “chat rooms” where people send messages to each other．
Most spam is sent by companies who are trying to get you to buy their products．Some of these are honest companies that offer good products or services for fair prices．These companies can offer their products for a cheaper price than you might find in a store．However, much of the spam on the Internet is sent by criminals who are trying to sell products that do not exist or offer services they will not provide．They are only interested in stealing your money．When you answer their spam you find you are expected to send them money and receive a gift．One country in Africa has become famous for the number of criminals who try every known trick to separate people from their money．
What does the underlined word “spam” in the first paragraph probably refer to?

A．Unwanted electronic information that reaches 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．

Which of the following is TRUE according to the text?

A．Spammers are people who receive spam on their computers．

B．Spammers are people who collect e-mail addresses from the Internet．

C．Companies who want to send a great deal of advertising are so-called spammers．

D．Either individuals or organizations can be regarded as spammers if they send out spam．

Which is the possible suggestion from the writer concerning spam?

A．Look out for any spam that reaches your computer．

B．Don’t trust any information on the Internet．

C．Buy what is cheaper in the spam．

D．Don’t buy anything advertised in the spam．

What is the main purpose of writing this passage?

A．To explain what spam is．

B．To find out who send out spam．

C．To warn readers of the possible dangers of spam．

D．To show the advantages and disadvantages of spam．