The author of the Wealth of Nations was（）
A. David Ricardo
B. Paul Samuelson
C. Adam Smith
D. Karl Marx
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Which of the following are reasons why increasing marginal costs of production arise？I. Different products use inputs to production in different proportions.II. Different inputs are better utilized in
A. III
B. II and III
C. I and II and III
D. I and II
All of the following can lead to an increase in the demand for ice cream, a normal good, EXCEPT（）
A decrease in income
B. An increase in the price of popsicles
C. A new scientific study that finds eating ice cream does not cause weight gain
D. A 10% increase in population
The one unknown word in fifty is something that can be learned through（）
A. guessing from context and which does not stop comprehension of the text
B. consulting the dictionary
C. asking teachers for help
D. asking classmates for help
Which of the following fluency activities for less advanced learners is not appropriate（）
A. The learners write down the numbers as the teacher quickly says them in an unpredictable order
B. Each student speaks to one partner about the given topic within three minutes; then they will repeat what they say to another partner, but within two minutes
C. Students write about an unfamiliar topic under time pressure
D. Learners are asked to do speed reading on a very easy graded reader
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