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
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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
It’s high time _____ about the traffic problem（）
A. anything will be done
B. something was done
C. nothing be done
D. something is done
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