If the crossprice elasticity of demand between lettuce and salad dressing is negative, then when the price of lettuce rises, the demand for salad dressing will ______（）
A. increase
B. decrease
C. remain the same
D. become more inelastic
查看答案
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
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
微信支付 
支付宝支付