单项选择题

It is generally believed that African wild elephants are more difficult to ________ than Asian ones.

A．cultivated
B．tame
C．breed
D．tend
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单项选择题
Some snakes, although having been tamed, can ________ attack people.
A．deliberately
B．reluctantly
C．unexpectedly
D．subsequently
单项选择题
People think that the pure scientist usually disregards the application of pure science to practical affairs, ________ his attention to explanation of how and why events occur.
A．refining
B．defining
C．confining
D．declining
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