Which word best indicates the kind of relationships in nature mentioned in the passage（）

单项选择题According to the passage, what is the best way for children to learn things（）

A. By copying what other people do.
B. By making mistakes and having them corrected.
C. By listening to explanations from skilled people.
D. By asking a great many questions.

单项选择题Where was ASEM held（）

A. Japan.
B. China.
C. Korea.
D. Vietnam.