【单选题】According to the passage, what influences society's attitudes?
B.
International businesses.
D.
Technological advances.
【简答题】What is the author's main concern?
【单选题】I'd like to write to him, but what's the______ ? He never writes back.
【判断题】点火正时必须随发动机的转速和负荷变化而变化
【简答题】What's the main idea of the passage? ( )