The risk of epidemics (流行病) may be slightly (high)（）in crowded urban areas than in rural areas.

A. It’ll be warm.
B. It’ll continue to be foggy.
C. It’ll be stormy.
D. It’ll clear up.

A. 30^th of December, 1916.
B. 30^th of November, 1916.
C. 30^th of November, 1906.
D. 30^th of December, 1906.