What did the researchers find in the National Park?
A.
Lions walking.
B.
Lions' tracks.
C.
Some camping facilities.
D.
Traps set by local hunters.
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参考答案:
举一反三
【单选题】Misty has the option of purchasing one of three products: Brand A, Brand B, or Brand C. Each costs ten dollars. If she decides that Brand A meets her needs best, then the opportunity cost of this deci...
A.
Brand B plus Brand C.
B.
twenty dollars.
C.
Brand
D.
Brand B or Brand C, depending on which is considered the highest-value alternative forgone.