4. What can be inferred
from the last paragraph of the passage?
A. "Sun-cure"
schools are becoming popular everywhere.
B. Switzerland is the
only country where "sun-cure" schools are popular.
C. Proper conditions
are necessary for the running of a "sun-cure" school.
D. "Sun-cure"
schools are found in countries where there is a lot of sunshine.
「答案与解析」本文介绍了利用日光治病的历史与发展。