单项选择题

The primary purpose of this passage is ______.

A．to persuade people to use the X-ray and the microscope
B．to keep people aware of the principal tools of the physician
C．to advise people to have a routine physical checkup
D．to describe the development of medicine

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单项选择题

The word malignant in line 7, paragraph 2 could best be replaced by ______.

A．harmless
B．deadly
C．vindictive
D．repulsive

单项选择题

In order to cope with most illnesses, the author thinks that people will have to do all of the following except ______.

A．find more curative rays
B．produce more curative drugs
C．develop more powerful diagnostic instruments
D．see through five inches of living flesh at least