简述科研论文与护理经验（体会）论文的主要不同之处。

A. To ask the patients about their medical treatment.
B. To compare the cities in Japan with other cities in the world.
C. To interview the mayor about the impact of the atomic cataclysm.
D. To find the differences between old Japan and modern Japan.

A. Because it must be emphasized.
Because it stands for Hiroshima.
C. Because it was what the city was said to be.
D. Because it was quoted from another article.