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【单选题】
All people who want to make international calls by using the pay phone need to dial the_____code first.A.
dress
B.
security
C.
country
D.
secret
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反馈参考答案：
举一反三
【单选题】If both the marginal cost and the average variable cost curves are U-shaped, at the minimum point of the average total cost curve, the marginal cost curve must be:
A.
greater than average variable cost.
B.
less than average variable cost.
C.
equal to average variable cost.
D.
at its minimum.
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