Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Chemicals.
B．Water.
C．Gas.
D．Vapor.

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.