单项选择题

Which event is a turning point in the American black’s struggle for equality

A．The War of American Independence.
B．The American Civil War.
C．Presdent Abraham Lincoln’s Emancipation Proclamation of 1862.
D．Martin Luther King’s speech I Have A Dream.
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单项选择题
A fish is swimming in the pond is transformed into There is a fish swimming in the pond . Which transformational rule is used
A．Copying.
B．Reordering.
C．Addition.
D．Deletion
单项选择题
The author maintains that habituation to excessive alcohol consumption can be learned. The method employed to do so, experimentally, which used reinforcement is______.
A．the introduction of alcohol into the bloodstream by infection
B．the increase of the concentration of alcohol in the subject’s drinking water
C．the use of anxiety in an avoidance - approach pattern
D．increasing the amount of alcohol the subject must drink each time before giving it a reward
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