看图,补全对话。 1. A: What is she doing? B: She is _________________________. 2. A: What is he doing? B: He is _________________________. 3. A: Why is she ____________________? B: Because it's time for bed.
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参考答案:
举一反三
【单选题】Economies of scale are:
A.
unit cost increases associated with learning effects.
B.
unit cost reductions due to inferior quality of products.
C.
realized when output is reduced to a minimum.
D.
realized when the selling price is equal to the cost price of the products.
E.
unit cost reductions associated with a large-scale output.