In 1935- 1936, Americans' attitude toward the other countries may be described as being ______.

A．The author is encouraging five-year-olds to address grownups by their first names, usually very formal and faithful.
B．First-namers claim they are motivated by nothing worse than uncontrollably high-spirited friendliness.
C．The author thought the secretary often dare not call their boss the first name.
D．He finds the secretary is often unwilling to pass a message.

A．the burning of the Reichstag
B．Hitler's invasion of Czechoslovakia
C．Nazi barbarism
D．the persecution of religious, groups in Germany