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
The author's primary purpose in this passage is to______.
A．describe different types of medicine
B．argue for the importance of medicine in health care
C．show the crucial role religion plays in medical treatment
D．compare the educational background of three different types of patients
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