单项选择题

A．Chemicals.
B．Water.
C．Gas.
D．Vapor.
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单项选择题
Which of the following statements is true
A．The physician has been able to make wonders alone in the world of medicine.
B．The cooperation between research workers in medicine and in the related sciences will bring about a "golden age of healing".
C．The X-ray and the microscope have been of little help in uncovering truth.
D．Medical workers fully understand electrical body measurements.
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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