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【单选题】
有广谱抗菌作用的抗结核药物是A.
乙胺丁醇
B.
氨苄西林
C.
青霉素C
D.
利福平
E.
异烟肼
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反馈参考答案：
举一反三
【单选题】Economists use theories to:
A.
abstract from the complexities of the world.
B.
understand economic behavior.
C.
explain and help predict human behavior.
D.
do all of the above.
【单选题】Economists use assumptions:
A.
to make the real world easier to understand.
B.
to make their models more accurately reflect the real world.
C.
to make their models more complex.
D.
to make it more difficult to understand how the real world operates.
【简答题】Scientists and economists A(believe) that human being B(can never) C(use away) all the D(mineral) resources on Earth.
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