A. a fierce competition B. an ideal goal C. a good opportunity D. a difficult task
单项选择题Economists are prone to().
A. emphasize the differences between economic growth and scarcity B. ignore the human creative and productive power C. see ecology from an economic perspective D. use different approaches to economy and ecology
单项选择题What makes people more tolerant of diversity between different groups().
A. Extensive communications. B. Language development. C. Close cooperation. D. Direct interactions.