问题
选择题
The book mainly tells that different countries have different customs.
A．gradually
B．mostly
C．fully
D．normally
答案
答案：B
题目分析：句意:这本书主语告诉了我们不同的国家有不同的风俗。mainly 的意思是主要地。gradually 渐渐的；mostly 主要地；fully 满地；normally 正常地。根据句意，故选B。