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

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.

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.