The Scarcity Principle states that（）
A. people don’t have enough money to buy what they want
B. society will eventually run out of resources
C. with limited resources, having more of one thing means having less of another
D. some countries have fewer resources than others
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Which of the following is likely to have the highest price elasticity of demand（）
A. shoes
B. running shoes
C. Nike running shoes
D. The price elasticity of demand will be the same for all of the answers listed
Which of the following violates the principle of being a reliable source（）
A. Use juggling statistics
B. Use updated materials
C. Use valid reasoning
D. Use truthful supporting materials
以下哪些是时间间隔类型（）
A. timestamp[（n）]
B. timestamp（n） with time zone
C. interval day[（n1）] to second [（n2）]
D. interval year[（n）] to month
Without sunlight, air and water, plants on the earth _____ well（）
A. will not grow
B. would not grow
C. had not grown
D. would not be grown
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