The diagram shows the demand curve, D1, and the supply curve, S1, for a good. The government decides to pay producers a specific subsidy for each unit supplied to the market. Which curve shows the new effective demand or supply curve?
【单选题】There is a kind of immune cell above the basal cell layer, which has the ability of phagocytosis and processing and transmitting antigen of contact allergy, called:
【简答题】Young Japanese people are evolving a new lifestyle for the 21st century based on the cell phones that few are now able to live without. While about one-third of Japanese primary school students aged 7...