单项选择题

Which of the following is suggested by computer experts

A．Don't rush to open any e-mail attachment.
B．Never open any e-mail attachment.
C．It's always safe to open an e-mail attachment from a friend.
D．Whenever you receive an e-mail, you should make a call to make sure whom it comes from.

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单项选择题

Which of the following is NOT right according to the passage

A．Something can be done to keep our computers safe.
B．Even an e-mail attachment coming from a friend may not be safe to open.
C．We should not use our computers to defend ourselves from viruses.
D．Anti-virus software made some years ago is hard to protect today's computers.

单项选择题

Why should anti-virus software be updated at least once a week

A．Because the newly published anti-virus software is more expensive.
B．Because the previous(先前的) anti-virus software cannot work any longer.
C．Because the inventors of viruses have suggested this idea.
D．Because computer viruses are always developing.