Mr. Brown did not tell us（）or not he'll be leaving next week.

单项选择题According to the passage, the American economy grows fast essentially because of（）

A．the people’s attitude towards work
B．people’s hard and careful work
C．the role of the government
D．the influence of the religion

单项选择题The advertisements before the 1880s（）

A．did not use images at all
B．used various types of images
C．ignored the role of images
D．used many slogans and brand names