In the first paragraph, the author discusses the economic treatment behind altruism in order to______.
A．treat it in a sociological perspective instead
B．demonstrate that the economic view of man is insufficient
C．argue that altruism is really a form. of self-interest
D．introduce his argument that charity is part of humanity

A.
A．treat
B.demonstrate
C.argue
D.introduce

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问答题
The author indicates in the text that public duty stresses______.
A．a necessary kind of craftiness to succeed
B．the recognition of an official duty of every citizen
C．a certain attention to details which may involve much sacrifice
D．a recognition that you should gain nothing from it personally
A.
A．a
B.the
C.a
D.a
问答题
Flies evolve to be smarter only in the labs fundamentally because______.
A．flies can adapt to the environment without learning
B．the cost of learning in the wild is too huge to bear
C．they may get some diseases as a byproduct in nature
D．the lab conditions allow them to learn better
A.
A．flies
B.the
C.they
D.the