If an economy has to sacrifice only one unit of good X for each unit of good Y produced throughout the relevant range, then its production possibility frontier has a(n):
A.
zero slope
B.
constant, negative slope
C.
increasing, negative slope
D.
decreasing, negative slope
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参考答案:
举一反三
【单选题】我的一个梦想是环游世界。
A.
My dream is to travel around the world.
B.
One of my dreams is to travel around the world.
C.
One of my dreams is to see the world with my own eyes.