【简答题】A.Why the book talks about turbidity currents. B.How winds can affect some ocean currents. C.The causes of underwater earthquakes. D.What a turbidity current is.
【单选题】Using the arc method, what is the price elasticity of demand of product X as price falls from its curren price of $20 to a new price of $10, and the quantity from 15 to 25.