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.
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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
According to the passage, which of the following statements is TRUE
A．Folk healers choose different herbs to cure diseases without any sound basis.
B．People who practice folk medicine need lots of formal education on herbs.
C．The success of folk medicine led to the development of doctor medicine.
D．Natural cures worked better than scientific medicine in ancient times.
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